Episode 56: Fluoride Science: Neurodevelopment Risks, Thyroid Function, and Water Filtration

Show Notes

Fluoride is the only medication delivered to the American public without their consent, and the science used to justify it does not look the way most of us were told.

In this episode, Dr. Ravi Kumar does a deep dive on fluoride: why it ended up in the water supply, what the original evidence actually showed, and what modern research now says about its risks. He starts with the principle that sits above everything else in medicine, informed consent, and the Nuremberg Code that enshrined it, then asks how a chemical medication ended up in three out of every four Americans’ tap water with no consent at all.

From there he traces the history: the rampant tooth decay of the 1930s and 1940s, the 1945 Grand Rapids trial that was abandoned after about 6 years instead of the planned 15, and how the policy was generalized nationwide before the controlled comparison was ever finished. He brings the story up to date with the 2024 Cochrane Review, which found more than 97% of fluoridation studies were at high risk of bias and that any modern added benefit is likely small in a world already saturated with fluoride from toothpaste, processed foods, and beverages.

Then he turns to the risk side of the equation, the part you rarely hear. Dental fluorosis now affects roughly 65% of American adolescents. The National Toxicology Program concluded with moderate confidence that higher fluoride exposure is associated with lower IQ in children, a JAMA Pediatrics meta-analysis of 74 studies found an inverse association that persisted below 1.5 milligrams per liter, and in 2024 a federal court ruled the EPA’s current allowable level poses an unreasonable risk to children’s brains. He also covers how fluoride competes with iodine to disrupt thyroid function and how its antibacterial action can blunt the oral bacteria responsible for roughly half of your daily nitric oxide.

Finally, Dr. Kumar separates fluoride’s real topical anti-cavity mechanism from its systemic toxicity, shares his own family’s story of using fluoride drops and municipal water for years, and introduces hydroxyapatite toothpaste as a clinically equivalent, non-toxic alternative. He closes with a concrete plan: reverse osmosis filtration for water, hydroxyapatite for teeth, and how to engage at the local level if you want fluoride out of your municipal supply.

In this episode, you will discover:

Fluoride is mass medication without consent: It is the only medication delivered to the public without informed consent, putting it at odds with the principle the entire rest of medicine is built on, and with the Nuremberg Code written in 1947
The original trial was abandoned early: The 1945 Grand Rapids study was designed to run 10 to 15 years but ended after about 6 when the control city demanded fluoridation too. The policy went national before the controlled comparison was finished
Modern evidence is thin: The 2024 Cochrane Review found more than 97% of fluoridation studies were at high risk of bias and that any additional benefit today is likely small, because most people already get fluoride from toothpaste and other sources
Dental fluorosis is common and rarely disclosed: Rates of dental fluorosis in American adolescents climbed from about 22% in the late 1980s to 65% by 2011 to 2012, with moderate-to-severe cases rising from about 1% to about 30%
The IQ signal is real and federally recognized: The National Toxicology Program linked higher fluoride exposure to lower childhood IQ, a JAMA Pediatrics meta-analysis of 74 studies found an inverse association persisting below 1.5 milligrams per liter, and a 2024 federal court ordered the EPA to act
Cumulative dose is the missing variable: American children get fluoride from water, toothpaste (1,000 to 1,500 parts per million), swallowing, processed foods, and dental varnish, so the total load may far exceed the water-only thresholds the safety case relies on
Fluoride disrupts the thyroid: As a halogen, fluoride competes with iodine. A 2024 meta-analysis found thyroid-stimulating hormone began climbing around 2.5 milligrams per liter, a marker of underactive thyroid
It alters the oral microbiome and nitric oxide: Fluoride’s antibacterial action can disrupt the tongue bacteria that convert dietary nitrate into nitric oxide, which relaxes blood vessels and lowers blood pressure and accounts for about half of daily production
The benefit is topical, the harm is systemic: Fluoride’s anti-cavity mechanism works on the tooth surface, but real-world overuse, swallowing, and absorption through the oral mucosa drive systemic exposure that has nothing to do with cavity prevention
Hydroxyapatite is a safer, equal alternative: Hydroxyapatite is the mineral enamel is made of. Head-to-head trials show it matches fluoride for cavity prevention (no increase in 89% vs 87% of subjects in one 18-month trial) while remaining safe to swallow
You can opt out: Reverse osmosis (with a remineralization stage) removes fluoride from water, a standard carbon Brita filter does not, and switching to a nano-hydroxyapatite toothpaste removes the toothpaste exposure with no loss in cavity protection

Key Takeaways

The strongest argument against water fluoridation is ethical before it is scientific: you should get to decide what goes into your body, every time
The evidence base behind fluoridation was built in the 1950s, before fluoride toothpaste and fluoridated processed foods existed, and has not held up under modern scrutiny
Risk and benefit have moved in opposite directions: the modern benefit looks smaller than claimed while the documented risks (fluorosis, IQ, thyroid) have grown
Total fluoride load, not the level in water alone, is what matters, and almost nobody is tracking it
Fluoride toothpaste works through a topical mechanism, so the systemic dose people absorb by overusing, swallowing, and mucosal absorption is risk without added benefit
Hydroxyapatite toothpaste gives you the cavity protection without the systemic downsides, making it an easy switch
Reverse osmosis with remineralization is the practical way to remove fluoride from drinking water; carbon pitcher filters do not work
Change at the policy level is local: water fluoridation is a municipal decision, and public comment at council meetings is where it actually shifts

Episode Resources

Dr. Ravi Kumar’s Website
Dr. Ravi Kumar on LinkedIn
Related listening: the recent episode with Dr. Nathan Bryan on nitric oxide and the oral microbiome

Transcript

[00:00 –> 00:43] Dr. Ravi Kumar: On this episode of the Dr Kumar Discovery, fluoride is something most of us never think about. It’s in the water that comes out of your tap. In the United States, it’s the only medication that is delivered to the population without their consent. Fluoride is, at this point, an uninformed mass medication of the American population. The science behind putting fluoride in the water has been seriously questioned, and a federal court has ruled that the currently allowable level of fluoride in water poses an unreasonable risk to children’s brains. And despite all that, the policy is still in place across most of the country. My name is Dr.

[00:43 –> 01:40] Dr. Ravi Kumar: Ravi Kumar. I’m a neurosurgeon in search of the causes of human illness and the solutions that help us heal and thrive. I want you to join me on a journey of discovery as I turn over every stone in search of the roots of disease and the mysteries of our resilience. The human body is a mysterious and miraculous machine with an amazing ability to self-heal. Let us question everything and discover our true potentials. Welcome to the Dr Kumar Discovery. Welcome to the Dr Kumar Discovery. My name is Dr. Ravi Kumar, and on today’s episode, we’re doing a deep dive on fluoride. Fluoride is something most of us never think about. It’s in your toothpaste, it’s put on your teeth at the dentist office, and for about three out of every four Americans on a public water system, it’s in the water that comes out of your tap.

[01:40 –> 02:28] Dr. Ravi Kumar: And we’ve been told for decades that putting fluoride in the water supply is one of the greatest public health victories of the twentieth century. So you might be wondering, why am I gonna dedicate a whole episode to fluoride, which is by most standards an answered question with scientific consensus? Well, here’s the reason. Fluoride is a medication. It’s a chemical medication that’s added to your drinking water with the explicit goal of changing a biological outcome in your body. And in the United States, it’s the only medication that is delivered to the population without their consent. Think about that. Every other medication you’ve ever taken, you had to agree to take.

[02:28 –> 03:25] Dr. Ravi Kumar: Vaccines, surgeries, physical exams, they’re all given by consent only. No one walks into your house and forces a flu shot into your arm. No one forces your child to swallow a pill. The decision is yours. But when it comes to fluoride, the federal and municipal governments decided decades ago that this medication was so important, so beneficial, that the rules of consent did not apply, and they put it in the water. This is an extraordinary thing if you really stop and think about it. So today, we’re gonna take this apart very carefully. We’re gonna look at why fluoride was added to the water in the first place, and what the dental health of America actually looked like at that moment in history. We’re gonna look at the actual data from the original trial that justified the policy and how that spread across the country.

[03:25 –> 04:29] Dr. Ravi Kumar: We’re gonna look at recent studies on fluoride in children’s IQ, fluoride in thyroid function, and the rising rates of dental fluorosis. We’ll also talk about the toothpaste in your bathroom, the mechanisms by which fluoride may prevent cavities, and the legitimate concerns with using fluoride toothpaste. Then I’m gonna introduce you to a really good toothpaste alternative that most people have never heard of and works just as good as fluoride toothpaste. And then finally, I’m gonna tell you exactly what you need to do if you wanna opt out of fluoridated water and fluoride in your body altogether. So before we move on, I just wanna say that this show is for informational purposes. It’s not meant as medical advice or to diagnose in any way. I want you to be informed, so you can ask the right questions and make the right decisions along with your healthcare practitioner. I truly believe that knowledge is power, and the more knowledge you have, the more empowered you are to take care of yours and your family’s health.

[04:29 –> 05:20] Dr. Ravi Kumar: Also, this show is separate from my role as assistant professor at UNC. Okay, let’s get back to fluoride. I wanna tell you why this topic matters so much, especially in the realm of public health, ethics, and medicine. In medicine, there’s one principle that sits above every technical skill, every medical capability, every diagnostic algorithm, every treatment protocol, and that principle is informed consent. Informed consent means that before I do anything to a patient, anything at all, from drawing a vial of blood to performing a craniotomy, I have to do three things. I have to explain the proposed intervention. I have to explain the potential benefits. I have to explain the potential risks, including the risk of not doing anything at all.

[05:20 –> 06:07] Dr. Ravi Kumar: And then the patient gets to decide, not me, not the hospital, not some public health committee, the patient. They get complete autonomy over their own bodies, and this is a sacred principle that should not be violated by any healthcare practitioner. And this principle didn’t appear out of thin air either. It was forged in the wreckage of the Second World War. You see, horrors were committed by the Nazis in the name of medicine in Nazi Germany during World War II. They experimented on Jewish people in concentration camps, which led to horrible suffering, torture, and death. The medical world came together in 1947 in the Nuremberg trials after the war and produced what is called the Nuremberg Code.

[06:07 –> 07:14] Dr. Ravi Kumar: The very first principle in that document was that voluntary consent of the human subject is absolutely essential. That sentence reshaped modern medicine. It said no matter how good you think the science is, no matter how much you believe the treatment will help, you do not get to make the choice for someone else. As a doctor, I would never force a treatment, a medication, a vaccine, or a surgery on anyone, not because the law says I can’t, but because it’s wrong. Every single person should have autonomy over their own bodies. The decision for any medical treatment belongs to them and only them, and that principle is foundational to everything we do in medicine. So with that in mind, I want you to consider that fluoride, which is a medication, is put in the water supply. If you drink municipal water, even if you have a Brita filter, you’re still consuming fluoride whether you want it or not. That, on its face, directly violates the principle of informed consent that I just talked about.

[07:14 –> 08:07] Dr. Ravi Kumar: So while that simmers in your mind, let’s move on and start talking about the history of fluoride and how it ended up being acceptable to put in the water. To truly grasp this, you have to understand what was happening to American teeth in the 1930s and ’40s. Tooth decay in the United States at the time was rampant. The American diet had shifted dramatically over the previous half-century. The industrialization of food production meant cheap, refined sugar was suddenly everywhere. White flour replaced whole grains. Sweetened processed foods became cornerstones of the daily diet. Combine that with limited access to dental care for working families and dental hygiene practices that were nothing like what we have today, and you had a serious problem, and the state of America’s mouth became a national security issue when the country went to war.

[08:07 –> 08:49] Dr. Ravi Kumar: During World War II, dental problems were one of the leading reasons young men were rejected from military service. Recruits were showing up with so many missing teeth or decayed teeth that they could not meet the basic dental requirements to serve. So when the war ended, public health officials were looking for a population-level intervention to do something about it. The seed of the idea of fluoridating the water supply came from a researcher named Trendley Dean. In the 1930s, Dean had been studying communities in Colorado where residents had brown stained teeth from naturally high fluoride levels in their water. The staining was a problem, but Dean noticed something else.

[08:49 –> 09:33] Dr. Ravi Kumar: Those same residents had fewer cavities than people in low fluoride areas. He hypothesized that if you could find the right amount of fluoride, low enough to avoid the staining, but high enough to give the cavity protection effect, you could potentially prevent tooth decay across an entire population just by adding fluoride to the water supply. So in January of 1945, that hypothesis was put to the test. Hey guys. I created this podcast because there’s too much confusion out there. There’s too much noise, too many conflicting messages about our health. My goal was simple when I made this podcast. I wanna cut through all of that and give you information that you can actually use.

[09:33 –> 10:08] Dr. Ravi Kumar: If that resonates with you, here’s how you can help. Leave a rating and a review on Apple Podcasts. Share an episode that resonated with you with someone else that you care about, and that’s how this show grows. That’s how we reach more people who are searching for answers. Thanks for being a part of this, and I appreciate your help. Grand Rapids, Michigan, became the first city in the world to add sodium fluoride to its public drinking water. The level was set at 1 part per million, and about 20,000 schoolchildren participated. The control city was Muskegon, Michigan, which was just up the road and kept its water unfluoridated.

[10:08 –> 10:55] Dr. Ravi Kumar: So the plan was a 10 to 15-year trial run by the US Public Health Service, the Michigan Department of Health, and the University of Michigan School of Dentistry, and after a few years, the early data started to come in, and the reductions in cavities looked dramatic. By 1955, the trial was reporting roughly a 65% reduction in tooth decay among Grand Rapids children compared to controls. Now, here’s where the story gets interesting, and this is the part that very few people know or hear. The Grand Rapids trial was not allowed to finish as designed. By 1950, before the control trial was anywhere close to complete, the US Public Health Service had already endorsed widespread community water fluoridation.

[10:55 –> 12:06] Dr. Ravi Kumar: The surgeon general signed off. The American Dental Association signed off. Cities all over the country started fluoridating their water supplies based on the early Grand Rapids numbers before the actual long-term controlled comparison was finished. And then the control city, Muskegon, watching the headlines about miracle reductions in cavities just up the road, demanded that their water be fluoridated too. Muskegon’s water was fluoridated in 1951. That ended the control comparison after about 6 years instead of the planned 15. So the trial that had become the foundation for fluoridating municipal water supplies across the United States, and eventually the world, was abandoned early, never completed as designed, and its results were generalized to a national policy before the data was fully in. Now, that detail matters because it sets up everything that has happened in the modern evaluation of this evidence. When the Cochrane Collaboration, which is the gold standard organization for evidence-based medicine reviews, went back in 2024 to look at the entire body of evidence on water fluoridation, they did not find robust scientific evidence supporting its use.

[12:06 –> 13:21] Dr. Ravi Kumar: They found that more than 97% of the studies on water fluoridation were at high risk of bias, and that the older studies, the ones the policy was actually built on, had serious methodological problems and were conducted before fluoride toothpaste even existed. And they found that in the modern era, where most people are already getting fluoride from toothpaste and other sources, any additional benefit from putting fluoride in the water is likely much smaller than was originally claimed. Now, I wanna be careful here. The Cochrane Review did not say water fluoridation does nothing. They said the modern benefit appears to be small, the evidence base is thin, and that any decision to continue or stop community water fluoridation needs to be made carefully in light of how much fluoride people are already getting from other sources.Okay, so let’s be honest about what we know and what we don’t know about fluoride. We do not have strong, modern, well-controlled evidence that adding fluoride to drinking water in 2026, on top of fluoride toothpaste and dental treatments, and fluoridated processed foods and beverages, produces a meaningful additional benefit in cavity prevention.

[13:21 –> 14:24] Dr. Ravi Kumar: We just don’t have that evidence. The original trials were conducted before any of these other sources of fluoride in human biology existed. So we are essentially running a policy designed for the 1950s in a modern fluoride landscape that looks nothing like it did in 1950. So based on this data I’ve given you so far, I personally would already be uncomfortable with fluoride in my drinking water. But let’s say you wanna give the policy the benefit of the doubt and assume that there is some small remaining benefit. Well, in that situation, you still have to look at the risk side of the equation, and the risk side is the side you never hear, and it’s also where the story gets a little bit uncomfortable. So let’s start with dental fluorosis, which is a risk that is well documented and almost never discussed. Dental fluorosis is what happens when too much fluoride is ingested while the teeth are still developing. It causes permanent changes to the enamel, which looks like white spots, streaks, and in worst cases, brown staining and pitting.

[14:24 –> 15:44] Dr. Ravi Kumar: It is a known, accepted, and expected side effect of fluoride exposure. And in the United States, the rates of dental fluorosis have been climbing rapidly. In the late 1980s, about 22% of American adolescents had some degree of dental fluorosis. By the mid-two thousands, that number had climbed to 41%, and by the most recent national survey covering 2011 to 2012, it was 65%. And the rate of moderate to severe fluorosis went from about 1% in the late 1980s to about 30% by 2011. So we are now causing visible permanent enamel changes in roughly two-thirds of American adolescents. That is a side effect of the policy of fluoridating water and giving it to tens of millions of children, and almost none of their parents were ever told this could happen. Now, let’s talk about the brain, because this is honestly the scariest risk. In August of 2024, the National Toxicology Program, which is the federal agency under the National Institute of Health, published a major analysis reviewing the evidence on fluoride in children’s IQ. They concluded with moderate confidence that higher levels of fluoride exposure are associated with lower IQ in children.

[15:44 –> 16:44] Dr. Ravi Kumar: The strongest evidence came from studies conducted in countries where pregnant women, infants, and children were exposed to fluoride at levels above 1.5 milligrams per liter in their water. The current US recommendation is 0.7 milligrams per liter, so that’s double the US level. And this is exactly where the conversation usually ends, with the defenders of fluoridation saying, “Well, that’s twice the US level, so it doesn’t apply to us.” But you have to think about this more carefully than that. The studies that showed an IQ effect at 1.5 milligrams per liter were largely done in countries where overall fluoride exposure to children may have been much lower. In the United States in 2026, water is just one of several fluoride sources. Children are also brushing twice a day with a fluoride toothpaste that contains 1,000 to 1,500 parts per million. They are swallowing a meaningful fraction of that toothpaste, especially under the age of 6.

[16:44 –> 18:11] Dr. Ravi Kumar: They’re getting fluoride from processed foods and beverages made with fluoridated water, and many are getting fluoride varnish applied at the pediatric dentist. So the cumulative dose, the amount of fluoride entering an American child’s body each day, may be substantially higher than the dose that those children in the overseas studies were getting from water alone. Whether that pushes American kids over the 1.5 milligrams per liter equivalent threshold is something we cannot say with certainty, because nobody’s tracking the total fluoride load. But it’s biologically plausible that it does, especially for kids who tend to swallow their toothpaste. So this is the part that should make you stop, because the defenders of the policy are arguing in effect that we are safely below the IQ-affecting threshold based on water alone. But the threshold was established in populations whose exposure to fluoride toothpaste, fluoridated sodas and drinks, and fluoridated processed food may have been very different. In addition, a meta-analysis, which was published in JAMA Pediatrics, which is one of the top pediatric journals in the world, pulled 74 studies looking at fluoride exposure in children’s IQ. They found a significant inverse association across the whole body of evidence. Among the studies they considered high quality, 18 out of 19 showed lower IQ associated with higher fluoride exposure.

[18:11 –> 19:24] Dr. Ravi Kumar: And critically, when they looked at the highest quality evidence, that inverse association was still present at exposure levels below 1.5 milligrams per liter. So that potential brain injury does not appear to disappear cleanly when you drop below the WHO threshold. Then, in September of 2024, a federal judge in California ruled that the EPA’s current allowable level of fluoride in drinking water poses an unreasonable risk of reduced IQ in children. The judge ordered the EPA to take regulatory action. So this is no longer a fringe scientific debate. It’s a federal court ruling on the official record. The EPA is now in the middle of a formal scientific review under the Safe Drinking Water Act, and the CDC is reconsidering its long-standing recommendation. Utah and Florida have already passed statewide bans in 2025, and yet, as we record this, the policy of fluoridating the drinking water is still in place in most of the country. So if that’s not enough, there’s also a thyroid issue that’s worth knowing about with fluoride. The thyroid uses iodine to make thyroid hormone.

[19:24 –> 21:06] Dr. Ravi Kumar: Fluoride and iodine, also called iodide, are both types of atoms called halogens, and there’s biological plausibility for the idea that fluoride could compete with iodine and disrupt thyroid production. A 2024 dose response meta-analysis published in the Journal of Environmental Research found that thyroid-stimulating hormone, which is a marker of underactive thyroid, started to climb at fluoride exposure around 2.5 milligrams per liter in water. Another systematic review published in PLOS One in 2024 found that 5 out of 7 studies linked fluoride exposure to thyroid dysfunction. And it’s worth bringing up here that fluoride is a very small ion. It absorbs readily through the oral mucosa, the tissue lining of your mouth, every time you brush, and it also absorbs from the gut when you swallow it. The 2.5 milligrams per liter water threshold is again based mostly on populations with different fluoride source exposure. If you add up an American adult brushing twice a day with absorption through the oral mucosa, plus whatever they swallow, plus fluoridated water, plus fluoridated beverages and processed foods, the cumulative daily dose may be approaching levels where thyroid effects start to appear. Whether it actually crosses that line is something we can’t prove yet, but the question deserves to be asked, and right now very few people are asking it. So if you have a thyroid problem, this is something that should be in your mind. Okay, so let’s start talking about your toothpaste, because this is something that you and your children do every day that may have significant repercussions on your biology, and it’s the easiest thing to change if you decide to.

[21:06 –> 22:19] Dr. Ravi Kumar: First, I should state that the mechanism by which fluoride prevents cavities is real. It’s not a myth. Tooth enamel is made mostly of a mineral called hydroxyapatite, which is a calcium phosphate compound. When the bacteria in your mouth feed on sugar, they produce acid, and that acid pulls calcium and phosphate out of your enamel. That process is called demineralization. If it goes far enough, you get a cavity. When fluoride is present in your mouth, two things happen. First, fluoride helps the enamel remineralize by pulling calcium and phosphate back into the structure. Second, fluoride incorporates into the new mineral and converts the hydroxyapatite into something called fluoroapatite, which is more acid resistant than the original hydroxyapatite, so the tooth becomes harder to demineralize the next time. Fluoride also has antibacterial effects against all the good and the bad bacteria in your mouth. So the mechanism is real, and it’s why topical fluoride genuinely does reduce cavities. So when somebody tells you that fluoride toothpaste prevents cavities, that’s not propaganda, that’s real. But here’s the part of the conversation you don’t hear.

[22:19 –> 23:51] Dr. Ravi Kumar: The benefit of fluoride toothpaste is mechanistically a topical effect. You’re putting fluoride on the surface of the tooth. The tooth doesn’t actually need you to swallow fluoride to benefit. So the design assumption of toothpaste is that you brush, you spit, and the fluoride does its work locally But that’s not actually what happens in the real world. Most people use way too much. The recommended amount is about a pea-sized dollop on your brush. Most people use a strip across the entire bristle head, which is several times the recommended dose. Children swallow a substantial fraction of whatever they put in their mouth, especially under the age of 6. Also, adults and children absorb fluoride through the oral mucosa, whether they spit afterward or not. That’s a lot of fluoride getting into the body in ways that have nothing to do with the topical mechanism that prevents cavities in the first place, and that ingested and absorbed fluoride is what drives the thyroid concerns and the IQ concerns and the dental fluorosis we’ve just talked about. And there’s also the oral microbiome question with fluoridated toothpaste. I had Dr. Nathan Bryan on the podcast a few weeks back, and we did a deep dive on nitric oxide and the bacteria living in your mouth. If you haven’t listened to it, it’s worth a listen because it ties directly into this. The short version is that there are specific bacteria on your tongue that convert dietary nitrate, the kind you get from leafy greens and beets, into nitrite and then into nitric oxide.

[23:51 –> 25:05] Dr. Ravi Kumar: Nitric oxide relaxes your blood vessels, lowers your blood pressure, and is essential to optimal health. And about half of your daily nitric oxide production depends on those oral bacteria in your mouth. Fluoride has antibacterial properties on its own, and the disruption of the oral microbiome compounds when you stack it on top of antiseptic mouthwash. A 2022 study in the journal Microbiome did find oral microbiome changes after 3 months of fluoride toothpaste use. So the effects are real and likely consequential. So here’s what we can say about fluoridated toothpaste. The mechanism does work when used properly, but properly means a tiny amount, perfect spitting, no swallowing, and acceptance that some fluoride is going to absorb through your oral mucosa anyway. In real life, almost nobody uses fluoride toothpaste that way. Children definitely don’t. So the actual experience of fluoride toothpaste in the real world includes meaningful systemic exposure that drives the very risks we’re trying to avoid with water fluoridation. The good news is that there’s an alternative that is essentially just as effective at preventing cavities as fluoride without any of the downsides.

[25:05 –> 26:13] Dr. Ravi Kumar: It’s called hydroxyapatite. Hydroxyapatite is the mineral that your tooth enamel is actually made of. Roughly 97% of the mineral content of your enamel is hydroxyapatite. So the idea behind the mechanism of hydroxyapatite toothpaste is the most biologically logical thing imaginable. You’re giving your enamel the exact raw material it needs to remineralize itself in the most native form possible. There’s no chemical conversion needed, there’s no antibacterial collateral damage, and there’s no concern about ingestion because hydroxyapatite is non-toxic. In fact, your body is full of hydroxyapatite because it’s a major part of what makes up your bones. And the clinical data on this is what really seals the deal when considering switching from fluoride toothpaste to hydroxyapatite toothpaste. There was an 18-month randomized double-controlled trial published in 2023 that compared hydroxyapatite toothpaste head-to-head against fluoride toothpaste in adults The hydroxyapatite group had no increase in cavities in 89% of subjects, and the fluoride group had no increase in 87%.

[26:13 –> 27:21] Dr. Ravi Kumar: They were essentially statistically equivalent. There was also a 1-year early child cavity trial that found essentially the same thing in young kids. A 2024 systematic review and meta-analysis published in the Journal of Dentistry concluded that hydroxyapatite is an effective anti-cavity ingredient in the absence of fluoride, suitable for people of all ages, and considered safe if swallowed. So we have a compound that is biologically identical to your enamel, that prevents cavities just as effectively as fluoride in head-to-head clinical trials, that does not disrupt your oral microbiome, that does not raise thyroid concerns, that does not contribute to dental fluorosis, and that is safe if your 3-year-old eats half the tube. That is not a fringe alternative. That is just a better tool. So when you have a tool that does the same job without the downsides, it becomes a no-brainer. That’s why my whole family has switched to hydroxyapatite toothpaste. Now, I have to say, we didn’t change away from fluoride toothpaste until recently, and we drank municipal water for years.

[27:21 –> 28:25] Dr. Ravi Kumar: And I’ve always been health-conscious, but honestly, even with my medical training, I just didn’t know. The medical dogma had me cornered into thinking that even though we hadn’t given consent for fluoride in water, it was the right thing for public health. In fact, when our children were little, our pediatrician even prescribed fluoride drops as a daily supplement, and we didn’t even question it. We trusted our doctor the way most parents do. We gave our kids fluoride drops and never sat down and asked the basic question: What does the actual evidence say, and what are the risks? Looking back, I regret that decision. I don’t say that to beat myself up, and I don’t say it to throw shade on our pediatrician, who was following the standard guidelines at the time. I say it because this is exactly the situation that the principle of informed consent is supposed to prevent. Nobody told us, “Hey, here are the benefits. Here are the risks, including the rising rates of fluorosis and emerging concerns about neurodevelopment.” And no one told us, “Hey, here are the alternatives.”

[28:25 –> 29:36] Dr. Ravi Kumar: And to be fair, we had the education, we had the ability, and we had the chance to research it on our own and make a decision. But blind, misplaced trust prevented us from doing it. The lesson I take from that situation is not that doctors are bad or that the system is corrupt. The lesson is that even smart, well-intentioned professionals can repeat dogma without checking it. The only protection any of us has is to learn, ask questions, and engage with our own care. Education and self-empowerment is what gets us out of these traps. Just empowering ourselves with knowledge and reason, and then making the best possible choices based on the evidence does the job and keeps us safe. So that’s the data on fluoride, and that’s my own personal history with it. Now, after hearing that, let’s say you decide that you don’t want excessive fluoride in yours or your children’s bodies. What can you actually do to reduce your fluoride exposure? Well, in drinking water, which is the first place to start, a reverse osmosis filter under your kitchen sink will remove fluoride.

[29:36 –> 30:49] Dr. Ravi Kumar: A standard carbon filter, like the kind in a Brita pitcher, does not remove fluoride at all, so don’t depend on that. Reverse osmosis is the gold standard for fluoride removal, and a decent under-sink unit costs a couple hundred dollars and pays for itself many times over. But RO does remove all the minerals in addition to the fluoride, so I would recommend adding a remineralization filter on the output of your RO system. If you wanna push to get fluoride removed from your municipal water supply at the policy level, the path is local. Water fluoridation is a municipal decision. The federal government doesn’t dictate it. They just give recommendations. So you need to contact your local water utility, you need to find out who oversees that authority, and you need to make your case to the city council, ideally in coordination with your neighbors, ‘cause more voices makes a bigger difference. And really, on the local level, public comment at council meetings is how this actually changes. Your state representative and your state health department are also useful contacts. You can also get help from the Fluoride Action Network, which is a national advocacy organization that maintains resources for communities that are working on this.

[30:49 –> 31:58] Dr. Ravi Kumar: And the EPA is currently in the middle of a formal scientific review under the Safe Drinking Waters Act, prompted by that federal court ruling that we talked about. And there’s usually a public comment opportunity that allows you to participate in that process. Now, for your toothpaste, my recommendation is to switch to a hydroxyapatite-based toothpaste. There are several reputable brands on the market now. Just look for the nano-hydroxyapatite or microcrystalline hydroxyapatite on the label as the primary ingredient. With this toothpaste, there’s no sacrifice in cavity prevention, but there’s significant gain in risk mitigation from avoiding fluoride exposure Okay, so those are my recommendations for opting out of fluoride in your bodies or your kids’ bodies. And let me wrap this up and leave you with some final thoughts. Fluoride is, at this point, an uninformed mass medication of the American population. It does not meet the sacred principles of medicine, and it does not honor the lessons we learned at Nuremberg, and it violates the basic doctrine of informed consent that has guided every other corner of our healthcare system since 1947.

[31:58 –> 33:24] Dr. Ravi Kumar: The science behind putting fluoride in the water has been seriously questioned. The original trial that justified the policy was abandoned early and never finished as designed. Significant risks have been raised as well, including dental fluorosis affecting two-thirds of American adolescents, real risks around children’s IQs, and biologically plausible concerns about thyroid function. The data that originally justified the policy has not held up under modern scrutiny, and a federal court has ruled that the currently allowable level of fluoride in water poses an unreasonable risk to children’s brains. And despite all that, the policy is still in place across most of the country. Okay, so I wanna wrap it up here, but first, I need to tell you where I stand on this issue. I always want you to make your own decisions based on the data, but I also want you to understand how I view the data and where I stand on these issues, and I do not think that fluoride should be in the water. The case for it is weaker than we were told based on those 1950s studies, and the case against it has gotten much stronger, and the entire framework of mass medication without consent is ethically wrong, regardless of whether the medication itself happens to work. And also, I do not think that fluoride toothpaste is the way to go when we have hydroxyapatite.

[33:24 –> 34:26] Dr. Ravi Kumar: Yes, there is molecular mechanisms by which fluoride prevents cavities when used properly, but most of the time it’s not used properly, and we have an alternative that works just as well clinically with none of the systemic risks. So in the case of fluoride, the risks have been understated to the public. There’s no doubt about that. The benefits have also been overstated, and the choice of whether you take fluoride into your body or not has been made for hundreds of millions of people without their input by putting it in the water. That is just wrong. It would be wrong if it were aspirin. It would be wrong if it were statins. The principle is that you should get to decide what goes in your body always, every time, end of story. So I want you to walk away from this episode with the information you need to make your own decisions. That is what informed consent is. I’m not telling you what to do. I’m just telling you what I think and why, and I’m giving you the data to think it through for yourself.

[34:26 –> 35:05] Dr. Ravi Kumar: And if after all this you decide you wanna keep drinking fluoridated water and brushing with fluoride toothpaste, that is your right, and I respect it completely. What I object to is the absence of choice in the first place, and I hope that was clear in this episode. Okay, so if this episode helped you at all, please pass it on to someone you know or love or someone who you think needs to hear it. Maybe it’s a family member with small children, or maybe it’s a friend with a thyroid problem, or maybe it’s your local councilman. Send them this episode, have them listen to it, and then have a real discussion with them about fluoride. That’s how change happens: by giving knowledge and making informed choices.

[35:05 –> 35:21] Dr. Ravi Kumar: Okay, folks, until next time, stay curious, stay skeptical, and stay healthy. Cheers.