Fluoride & IQ: The 51 Studies

“As of September 2017, a total of 58 studies have investigated the relationship between fluoride and human intelligence, and over 40 studies have investigated the relationship fluoride and learning/memory in animals. Of these investigations, 51 of the 58 human studies have found that elevated fluoride exposure is associated with reduced IQ, while 45 animal studies have found that fluoride exposure impairs the learning and/or memory capacity of animals. The human studies, which are based on IQ examinations of over 12,000 children, provide compelling evidence that fluoride exposure during the early years of life can damage a child’s developing brain.” – From Fluoride Action Network,

Get the facts: Fluoride & IQ: The 51 Studies


New Study Quantifies Fluoride’s Potential to Reduce IQ in Children

By Dawna Gallagher-Stroeh / Sonoma County Gazette (11/21/2017)
Dawna Gallagher-Stroeh is the Executive Director of Clean Water Sonoma-Marin. Contact her at 707-547-7006.

The first U.S. Government-funded study investigating prenatal neurological damage from fluoride, Prenatal Fluoride Exposure and Cognitive Outcomes in Children at 4 and 6–12 Years of Age in Mexico, finds that each 0.5 part per million (ppm) increase in a pregnant woman’s urine fluoride levels reduced her child’s IQ by 2.5 – 3 points.

The new study is unique in approach, size, and duration, but it joins over 50 other human-based studies finding evidence of fluoride-based cognitive damage affecting IQ.

The full peer-reviewed study,  a 12 year analysis of data from 287 mother-child pairs, was published in the journal Environmental Health Perspectives (9/19/2017), and can be downloaded at the U. S. National Institutes of Health (NIH) website: https://ehp.niehs.nih.gov/wp-content/uploads/2017/09/EHP655.alt_.pdf

Dr. Howard Hu, Dean of the University of Toronto School of Public Health, headed a team of scientists from University of Toronto, University of Michigan, McGill University, and Harvard, analyzing data from 287 mother-child pairs in Mexico City. A press release from the University of Toronto School of Public Health describes the study’s methodology:

The research team analyzed urine samples that had been taken from mothers during pregnancy and from their children between six and 12 years of age to reconstruct personal measures of fluoride exposure for both mother and child.

“This is significant because previous studies estimated exposures based on neighborhood measurements of drinking water fluoride levels, which are indirect and much less precise measures of exposure. [Previous studies] also looked at children’s exposures instead of prenatal exposures or had much smaller sample sizes of subjects to study,” said Dr. Hu .

The researchers then analyzed how levels of fluoride in urine related to the children’s verbal, perceptual-performance, quantitative, memory, and motor abilities at age four and once more between the ages of six and 12. Analyses were adjusted for other factors known to impact neurodevelopment, such as gestational age at birth, birthweight, birth order, sex, maternal marital status, smoking history, age at delivery, IQ, education, socioeconomic status and lead exposure.

The study found “…higher levels of maternal urinary fluoride during pregnancy (a proxy for prenatal [placental blood] fluoride exposure) that are in the range of levels of exposure in other general population samples of pregnant women as well as nonpregnant adults were associated with lower scores on tests of cognitive function in the offspring at 4 and 6–12 y old.”  Read the full article.

In his review of the new study, in the Lund Report, Rick North notes: “The decrease was significant. Each 0.5 part per million (ppm) increase in a pregnant woman’s urine fluoride levels reduced her child’s IQ by 2.5 – 3 points. The child of a mother drinking 1 ppm of fluoridated water, close to the U.S standard of 0.7 ppm, would be expected to have a drop of 5 to 6 IQ points compared to a child of a mother drinking water with close to no fluoride in it…

North further reports: Mexico, like most nations, doesn’t fluoridate its water. The ADA [dismisses the study because] the women were mainly getting their fluoride from consuming fluoridated salt or varying natural levels of fluoride in the water.

North explains: “The ADA ignores the fact that fluoride’s effects are the same once it’s inside the body, no matter the source. Most others felt differently.

Lead researcher Dr. Howard Hu asserted, “This is a very rigorous epidemiology study. You just can’t deny it. It’s directly related to whether fluoride is a risk for the neurodevelopment of children. So, to say it has no relevance to the folks in the U.S. seems disingenuous.

In fact, in other contexts, fluoridation proponents frequently say, “A fluoride ion is a fluoride ion.” Read the full article.

When asked by a student, “Why are people not being seriously poisoned by drinking fluoridated water?” fluoride researcher Dr. Richard Sauerheber (B.A. Biology, Ph.D. Chemistry) replied, “Very few if any fluoridation promoters understand that fluoride at any level in the blood exerts toxic effects to varying degree in man and animals.

“At 3-4 ppm, as happened with citizens in Hooper Bay, AK during an accidental overfeed, this level is lethal (one victim perished from fluoride-induced heart block).

“At 1 ppm in the blood, as occurred in kidney dialysis wards where blood levels matched the level in the feed water, patient morbidity escalated (perishing from heart failure by a different mechanism over months of time). These events led to an FDA warning that fluoridated water cannot be used in kidney dialysis.

“At lower levels, around 0.1 ppm as occurs in people consuming fluoridated water, the chronic toxic effects are incorporation of fluoride into bone permanently, causing formation of bone of poor quality, and in some people hypothyroidism, and effects on the brain with IQ lowering and possible ADHD increases.

“Of course adverse effects on teeth enamel, hypoplasia or dental fluorosis, continues to skyrocket in incidence in U.S. teens where blood fluoride blocks normal enamelization during teeth development in children.

The FDA never approved of any fluoride intended for ingestion, and banned the sale of fluoride compounds intended for ingestion by pregnant women in the U.S…”

In other words, people are already being seriously poisoned by drinking fluoridated water. See Dr. Sauerheber’s full Comment.

To understand more, watch the brief Fluoride Action Network (FAN) video by chemist and toxicologist, Professor Paul Connett, PhD:

At the September 2016 Sonoma County Dental Health Summit, our Public Health Officer was enthusiastic about the study, Effect of Supplementation of Fluoride on Maternal Periodontal Health, Preterm Delivery, and Perinatal Well-Being (clinical trials for the study began in 2015 and continue to the present).

The Fluoride Supplementation study itself warns: “The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details.” https://clinicaltrials.gov/show/NCT02536352

In-utero fluoride exposure adversely affects a child’s IQ, the FDA has not approved fluoride for ingestion, and yet researchers are experimenting on pregnant women by prescribing fluoride supplements.

In the middle range, a few IQ points might not be missed, but lowering average IQ means, at the high end, fewer gifted people solving society’s problems, and more mentally deficient people that society would have to deal with and care for.

A cavity can be fixed, but a child’s brain, once damaged, cannot.

Please help protect our children. Put “Prenatal Fluoride Exposure and Cognitive Outcomes” in the hands of obstetricians and pediatricians now. Printable PDF: Prenatal Fluoride Exposure and Cognitive Outcomes in Children at 4 and 6–12 Years of Age in Mexico. Link: https://ehp.niehs.nih.gov/wp-content/uploads/2017/09/EHP655.alt_.pdf


US Government Study Finds Fluoride Significantly Reduces IQ

The results of the first ever US government funded study on the effects of fluoride on IQ have now been published. A team of researchers funded by the National Institutes of Health found that low levels of fluoride exposure during pregnancy is linked to significantly reduced IQ in children, according to a study published on September 19, 2017, in the journal Environmental Health Perspectives.

The study, entitled “Prenatal Fluoride Exposure and Cognitive Outcomes in Children at 4 and 6–12 Years of Age in Mexico”, was conducted by a team of scientists from University of Toronto, University of Michigan, Harvard, and McGill, and found: “…higher levels of maternal urinary fluoride during pregnancy (a proxy for prenatal fluoride exposure) that are in the range of levels of exposure in other general population samples of pregnant women as well as nonpregnant adults were associated with lower scores on tests of cognitive function in the offspring at 4 and 6–12 years old.”

Chemist and Toxicologist, Professor Paul Connett, PhD shares
important information regarding the National Institutes of Health study

Read the study here

We must warn our expectant mothers!

Join us at City Hall on Monday, October 2 at 5:30pm

In 2014 Safe Water Healdsburg presented Healdsburg City Council with a letter signed by hundreds of concerned residents requesting that the standard CDC warning concerning fluoride consumption by infants be printed on our water bills. Regretfully, City Council rejected the public’s request. In light of the findings of this new study it is imperative that we warn our expectant mothers that ingesting Healdsburg’s fluoridated water will likely reduce the IQ of their unborn children. Join us at the City Council Meeting on Monday, October 2 at 5:30pm and let the council members know that the city has a moral obligation to warn our families about the dangers that come with ingesting our fluoridated water.

City Hall [map]
401 Grove Street
Healdsburg, CA 95448


Groups Urge EPA to Ban Fluoridation Based on Risk to Brain

New York – November 30, 2016 – A coalition of environmental, medical and health groups have served the Environmental Protection Agency (EPA) with a Petition calling on the Agency to ban the addition of fluoridation chemicals to public water supplies due to the risks these chemicals pose to the brain, reports the Fluoride Action Network (FAN).

The Petition, which includes over 2,500 pages of supporting scientific documentation, explains that “the amount of fluoride now regularly consumed by millions of Americans in fluoridated areas exceeds the doses repeatedly linked to IQ loss and other neurotoxic effects.” Signers include FAN, Food & Water Watch, Organic Consumers Association, American Academy of Environmental Medicine, International Academy of Oral Medicine and Toxicology, and Moms Against Fluoridation.

“If EPA applies its own risk assessment guidelines to fluoridation, we believe it will agree that fluoridation poses an unacceptably high risk to the brain,” says attorney Michael Connett, FAN legal adviser.

The Toxic Substances Control Act (TSCA) authorizes EPA to prohibit the “particular use” of a chemical that presents an unreasonable risk to the general public or susceptible subpopulations. TSCA gives EPA the authority to prohibit drinking water additives.

Subpopulations especially vulnerable to fluoride’s neurotoxic effects include infants, the elderly, kidney patients, and the nutrient deficient (e.g. iodine and calcium). Evidence also suggests that African-Americans may suffer disproportionate harm as well.

Read more at Fluoride Action Network


Safe Water Healdsburg with Steve Jaxon on KSRO

Listen to the archived Steve Jaxon interview with Dawna Gallagher of Clean Water Sonoma-Marin and Paul Gullixson, Editor of the Press Democrat about Measure T. Dawna explains how YES on Measure T will require proof of safety for our fluoride. Mr. Gullixson explains the city’s position – “they’re really not interested in proving it’s safe.

Listen here: YES on T on The Drive with Steve Jaxon – KSRO


Fluoride – another toxic product from China?

Our fluoride comes from China. Below is a list of other items imported from China that have been found to be toxic and recalled: cosmetics, toys, dog food, cat food, laminate flooring, drywall, gardening gloves, baby bibs, notebooks, jewelry, herbal supplements, candy, ginger, shrimp, fish, toothpaste. Does fluoride belong on this list? Let’s test it and find out, our health depends on it. Vote yes on T.


Healdsburg officials say proving fluoride safety is impossible.

Update: Court rules that City of Healdsburg violated elections code by forcing “misleading, inaccurate, and biased” ballot language for Measure T, the fluoride safety initiative.

By Ray Holley | Managing Editor | The Healdsburg Tribune

Healdsburg voters will be asked again this year whether to continue fluoridating city water, but the wording of the initiative is the subject of a legal battle this week.

Fluoride opponents lost a ballot effort to ban fluoridation two years ago and came back this year with a new tactic. A petition was circulated that, if placed on the ballot and passed, would require manufacturers of the fluoride additive to prove it is safe before it can be added to drinking water.

Healdsburg officials say proving such a thing is impossible and the Healdsburg City Attorney recommended changing the lengthy ballot language to a simple yes-or-no on the subject of fluoridation.

The language suggested by the petition was: “Shall the City of Healdsburg institute a moratorium on all municipal water fluoridation until the manufacturer supplying the fluoridating chemical provides the public with an accurate list of all contaminants and their amounts for each batch sold to the City, a detailed toxicological report on the fluoridating chemical, and a written verification of the chemical’s safety for ingestion by all water consumers, once introduced into the water supply?”

The city attorney suggested changing the language to: “Shall the City of Healdsburg stop fluoridating its water supply?”

Anti-fluoride activists protested and charged that the city is violating state election law by substantially changing the language that was on the petition signed by local voters. Healdsburg officials counter that the language is misleading and the city has a duty to give the voters a clear and unambiguous choice.

Read more @ The Healdsburg Tribune

To donate or volunteer, contact:
Jeannie Rudd, Campaign Coordinator
Healdsburg for YES on Measure T
707-542-1723 or emails us here.
Truth & Transparency



Since the hiring of an outside person as Health Department officer for Sonoma County’s Health Services to bring fluoridation to Sonoma County’s drinking water, I have had nothing but questions.

But before I ask my questions, there are a few things I learned that I didn’t know before this fluoride campaign got started. I found out that:

  • The only city in Sonoma County that fluoridates their drinking water is Healdsburg
  • That neither infants nor fetuses are supposed to have fluoridated water
  • That no water dispensers, private or public, have or will label that the water is fluoridated
  • That there is no practical way to treat fluoride in wastewater so that the County will allow fluoridated water to get into our waterways and expose all the wildlife to this chemical

There are many other reasons to wonder about the wisdom of adding fluoride to drinking water but the above statements are undisputed, so let’s put them together in the form of questions.

Read More


3 Simple Reasons to Oppose Water Fluoridation

Truth and Transparency - YES on T

“…the FDA has never approved fluoride supplements for the prevention of tooth decay. Because of fluoride’s toxicity, you can only buy a fluoride “supplement” if you have a doctor’s prescription.”

Dan Kenner, Ph.D. Naturopathic Medical Science, L,Ac.

I am a writer and researcher in health care (The Whole-Body Workbook for Cancer) with 35 years of clinical experience, and would like to make three simple points about the water fluoridation issue:

1. We already get enough fluoride in our food and drink: If you drink any kind of juice (or wine) on a regular basis, you’re probably getting hefty doses of fluoride. Grapes are heavily sprayed with cryolite, a fluoride-based pesticide, and white grape juice is used as the base or filler juice in many juice drinks.

Cereals, mechanically deboned meats, and black or green tea are a few other significant sources. If people feel that this is not enough fluoride of course they are free to buy any of the many fluoridated dental products.

2. Ingesting fluoride doesn’t prevent tooth decay: According to the Centers for Disease Control and research published in peer-reviewed scientific journals, fluoride ingestion is ineffective at reducing tooth decay and is harmful to health. Further, the FDA has never approved fluoride supplements for the prevention of tooth decay. Because of fluoride’s toxicity, you can only buy a fluoride “supplement” if you have a doctor’s prescription.

3. Fluoride is hazardous to brain function: A recent Harvard University study found that children in high-fluoride areas were found to have significantly lower IQs than those who lived in no-fluoride or low-fluoride areas. Researchers speculate that young brains may not be able to fully develop if the fluoride toxicity damages the brain at a very early age. Harvard researcher Philippe Grandjean, MD, commented that “Fluoride seems to fit in with lead, mercury, and other poisons that cause chemical brain drain.” This is only one of several health threats that fluoride presents.

The Sonoma County Gazette


Could Your Water Be Giving You Heart Disease?


A form of calcium, hydroxylapatite, is known to gradually harden and calcify arteries and lead to atherosclerosis. Fluoride forms fluorapatite by replacing hydroxyls in hydroxylapatite—simply put, this process enhances the cardiotoxic effect and makes it harder for your body to remove it.

I can’t stress the importance of regularly consuming water enough. I personally drink at least eight to 10 eight-ounce glasses of water every day to support my healthy body. It is well known that drinking plenty of water is important for proper hydration, body temperature regulation, digestion, and nutrient metabolism. It is also crucial in maintaining the health of nearly every organ in the body.

It’s not just important that you drink water, but that you also consider the type of water you consume. I always get my water from a filtered tap, because municipal drinking water straight from the tap is known to contain a heavily toxic chemical—fluoride.

Fluoride is added to municipal water without your permission to help prevent tooth decay; however, the risks outweigh the rewards in this case. Water fluoridation has been linked to several health problems, including brain damage, permanent teeth discoloration, and dental enamel fluorosis—caused by exposure to excessive amounts of fluoride

But fluoridated water is now also suspected to lead to stroke, heart attack, or heart failure, meaning you could unknowingly be drinking yourself to heart disease.

I read a study recently in the journal Toxicology that shed some light on heart complications and water fluoridation. The study observed the effect of fluoride exposure in a cell model (in vitro) and a rat model (in vivo). This study suggested that fluoride exposure could potentially lead to heart disease.

Read the full article at Doctor’s Health Press