New study finds fluoride lowers IQ in children

There are signs that Americans are getting more stupid. See:

Here’s one reason why: fluoride in our drinking water.

In the United States, fluoride is added to drinking water at levels of 0.7–1.2 mg/L to promote dental health by preventing cavities. Fluoride is also found in varying degrees in salt, milk, and dental products, while fluoride supplementation has been recommended to prevent bone fractures.

A recent study by a team of 15 scientists found that pre-natal (in the womb) exposure to fluoride, at levels for the general population (i.e., common drinking water), is associated with lower IQs in children.

The 15 scientists are:

  • Morteza Bashash (senior author) and Howard Hu of Dalla Lana School of Public Health, University of Toronto, Ontario, Canada.
  • Deena Thomas, Brisa N. Sanchez, Karen E. Peterson, Adrienne S. Ettinger, Zhenzhen Zhang and Yun Liu, of University of Michigan School of Public Health.
  • E. Angeles Martinez-Mier of Indiana University School of Dentistry, Indiana University-Purdue University Indianapolis.
  • Niladri Basu of Faculty of Agricultural and Environmental Sciences, McGill University, Montreal, Quebec, Canada.
  • Robert Wright of Icahn School of Medicine at Mount Sinai, New York.
  • Lourdes Schnaas of Instituto Nacional de Perinatología, Mexico City, Mexico.
  • Adriana Mercado-García, Martha María Téllez-Rojo and Mauricio Hernández-Avila, of Instituto Nacional de Salud Pública, Cuernavaca, Morelos, Mexico.

Morteza Bashash, et al., published their findings in an article titled “Prenatal Fluoride Exposure and Cognitive Outcomes in Children at 4 and 6–12 Years of Age in Mexico,” in the peer-reviewed journal, Environmental Health Perspectives, vol. 125, issue 9 (September 2017).

Here is the article’s Abstract:

Background: Some evidence suggests that fluoride may be neurotoxic to children. Few of the epidemiologic studies have been longitudinal, had individual measures of fluoride exposure, addressed the impact of prenatal exposures or involved more than 100 participants.

Objective: Our aim was to estimate the association of prenatal exposure to fluoride with offspring neurocognitive development.

Methods: We studied participants from the Early Life Exposures in Mexico to Environmental Toxicants (ELEMENT) project. An ion-selective electrode technique was used to measure fluoride in archived urine samples taken from mothers during pregnancy and from their children when 6–12 y old, adjusted for urinary creatinine and specific gravity, respectively. Child intelligence was measured by the General Cognitive Index (GCI) of the McCarthy Scales of Children’s Abilities at age 4 and full scale intelligence quotient (IQ) from the Wechsler Abbreviated Scale of Intelligence (WASI) at age 6–12.

Results: We had complete data on 299 mother–child pairs, of whom 287 and 211 had data for the GCI and IQ analyses, respectively. Mean (SD) values for urinary fluoride in all of the mothers (n=299) and children with available urine samples (n=211) were 0.90 (0.35) mg/L and 0.82 (0.38) mg/L, respectively. In multivariate models we found that an increase in maternal urine fluoride of 0.5mg/L (approximately the IQR) predicted 3.15 (95% CI: −5.42, −0.87) and 2.50 (95% CI −4.12, −0.59) lower offspring GCI and IQ scores, respectively.

Conclusions: In this study, higher prenatal fluoride exposure, in the general range of exposures reported for other general population samples of pregnant women and nonpregnant adults, was associated with lower scores on tests of cognitive function in the offspring at age 4 and 6–12 y.

Some other interesting points from the study:

  • The EPA (Environmental Protection Agency) had determined 4 mg/L to be the maximum contaminant level goal (MCLG) for the amount of fluoride in public drinking water. MCLG refers to a fluoride concentration at which no adverse health effects are expected.
  • In 2006, the EPA asked the National Research Council (NRC) to reevaluate the MCLG to determine if the standards were adequate to protect public health. NRC concluded that the MCLG of 4 mg/L should be lowered because it puts children at risk of developing severe enamel fluorosis and may be too high to prevent bone fractures caused by fluorosis. Moreover, there is experimental and epidemiologic evidence that fluoride may be neurotoxic.
  • At the time, the NRC found that healthy U.S. adults exposed to optimally fluoridated water had urinary fluoride concentrations ranging from 0.62 to 1.5 mg/L.
  • The study by Morteza Bashash, et al., was conducted on mother-child pairs in Mexico City, Mexico, where the natural water fluoride levels range from 0.15 to 1.38 mg/L., which is much lower than the U.S. maximum contaminant level goal of 4 mg/L. In addition, the participants in the study have also been exposed to fluoridated salt (at 250 ppm).
  • Effect of prenatal exposure to fluoride on the child’s IQ score is 2.5 points lower with a 0.5 mg/L increase in prenatal exposure.
  • The findings of Bashash, et al., are “consistent with the ecological studies suggesting children who live in areas with high fluoride exposure (ranging from 0.88 to 11.0 mg/L fluoride in water, when reported) have lower IQ scores than those who live in low-exposure or control areas (ranging from 0.20 to 1.0 mg/L fluoride in water)” and with other recent studies.

Bashash, et al.‘s conclusion is that:

“[Whereas] Community water and salt fluoridation, and fluoride toothpaste use, substantially reduces the prevalence and incidence of dental caries (Jones et al. 2005) and is acknowledged as a public health success story . . . However, our findings, combined with evidence from existing animal and human studies, reinforce the need for additional research on potential adverse effects of fluoride, particularly in pregnant women and children, and to ensure that the benefits of population-level fluoride supplementation outweigh any potential risks.”


In addition to lowering intelligence, years ago it was found that fluoride may also lead to an early onset of puberty in girls.

In a Dec. 4, 2008 article, Dr. Mercola explains that:

  • The pineal gland is a small gland located between the two hemispheres of the brain, which regulates the production of the hormone melatonin.
  • Melatonin is a hormone that helps regulate the onset of puberty and helps protect the body from cell damage caused by free radicals.
  • Dr. Jennifer Luke from the University of Surrey in England found that fluoride accumulates in the pineal gland, and that experimental animals treated with fluoride had lower levels of circulating melatonin, resulting in an earlier onset of puberty in the fluoride-treated female animals.
  • In addition to other environmental chemicals — PCBs and endocrine-disrupting chemicals of BPA, phthalates and PFOA (Teflon) — fluoride may contribute to U.S. girls reaching puberty at younger ages than ever before. In the 1990s, breast development — the first sign of puberty in girls — at age 8 was considered an abnormal event that should be investigated by an endocrinologist. A study in 1997 found that almost half of African American and 15% of white girls had begun breast development by age 8. Some studies have even found girls as young as 2 who are starting sexual development.


14 responses to “New study finds fluoride lowers IQ in children

  1. Reblogged this on Exposing Modern Mugwumps and commented:

    For even more information on how damaging Fluoride is to all of us, get the book, THE FLUORIDE DECEPTION!

    Liked by 3 people

  2. We are paying our government to poison us and our children.

    Liked by 3 people

  3. We have to protect children from harmful “hidden” substances, not only in water, but food as well. At a very minimum, all parents should install filtration systems on their tap water. Better yet, move to a rural area, cut the cable, pull them out of public schools and dig yourself a well and garden – and still filter all drinking water. Children’s senses (all of them) are under attack.

    Liked by 4 people

  4. What on Earth good is a reduction of 25% in dental caries, if you are subsequently experiencing impaired intelligence. Better to have bad teeth and a good healthy brain. One can always pay for restorative dental work, but once your brain has lost its natural intelligence you are just plain out of luck!

    Excellent article.

    Liked by 1 person

  5. From time-to-time I get a chance to ask the average two year College Adult Student a typical 50’s Eight-Grade Question.. I’m lucky to get a Fourth Grade Answer from them.. Most times I get a blank stare or an “I don’t know.!!

    Liked by 2 people

    • Pretty much… the standard business letter we learned in 6th Grade years ago is now too verbose and “hard to read” when sent to adults as an e-mail today. (Yes, each line now must be a separate paragraph and much shorter “directly written” sentence, plus the overall letter can’t include “too much,” now.)

      Liked by 2 people

  6. Not sure about Fluoride. But the difference between the races so far as early female pubescent development is pretty odd… and it doesn’t support the idea of Fl being the culprit, as it’s too ubiquitous to be the determinative factor. It’s added to the public water supply of virtually all incorporated municipalities, regardless of race, color, etc. so why the disparities?

    Are the white girls just sucking on bottled water ALL DAY, every day, while the colored girls all drink from public fountains? At such rates as would support such large percentage differences? I don’t buy that.

    I think it has to be something more along the line of DNA (race) and likely what they’re eating (or not)… If we’re interested in seeing fewer colored grandmothers in their 30s (as we do where I live), it’s something about which we should be acting. You can’t bear children in your early teens (and likely won’t attract boys to help out) if you’re not developing when you’re 8 to 12.

    Back when we were an agrarian society, even to some extent as an industrial society, maybe. But we’ve evolved to an information-knowledge society, where completing one’s education is extremely important. Being pregnant (or even thinking about such things) in grade school and junior high makes that a tough target at which to aim. It sets one up for failure and dependence.

    Liked by 2 people

    • A big part of the early sexual development is related to so formula. Of course a much higher percentage of black babies are getting so formula because it’s provided for free by Medicaid. But it’s very very damaging to the reproductive and hormonal systems of boys and girls. So you have a lot of feminized black boys and over developed black and Hispanic girls.


    • cogito:

      Even without fluoride and other contaminants in our drinking water (e.g., estrogen from birth control pills), there are inherent racial differences in maturation rate (and brain size, bone density, susceptibility to disease, and the most controversial of all, intelligence).

      “Blacks also have shorter gestation periods than whites or Asians. By the 39th week, 51 percent of black babies have been born but only 33 percent of whites. By the 40th week, the figures are 70 percent and 55 percent. Shorter gestation seems to be a characteristic of blacks that is independent of social status or access to medicine.

      Prof. J. Philippe Rushton of the University of Western Ontario, who has probably studied maturation rates more extensively than anyone else, reports that rapid development of blacks continues after birth. Many African and black American newborns can hold their heads up whereas white and Asian newborns almost never can. The average age at which black children walk is 11 months, compared to 12 months for whites and 13 months for Asians.

      Prof. Rushton has found that blacks reach sexual maturity earlier than whites. By age 12, 19 percent of black girls have full development of breasts and pubic hair, whereas only two percent of white girls do. Black American women menstruate at an earlier age than white women. They then go on to have sexual intercourse for the first time at an average age that is two years younger than that of whites.”


  7. Whether fluoride used by pregnant mothers causes the children born from them to grow up with a reduced IQ I couldn’t say, but I do know that using fluoride after being born doesn’t seem to have any effect on intelligence. I was raised in a military family. My dad served 30 years in the military and retired the same year that I graduated high school (as the youngest among my siblings). Not only was there fluoride in my drinking water all the time, not only did I use toothpaste that included fluoride, but every year of my childhood I was given a fluoride treatment that I swished about inside my mouth and spit out. During the time since I have achieved a PhD and have a very high IQ (My older sister, who has the next highest IQ in my family among my siblings, has a Master’s Degree in her field). I may not be exactly genius level, but I’ll give any recorded genius a run for his money. Did all that fluoride harm me or my intelligence? It wouldn’t appear so. Granted, I’m only one case out of many, but if the claim is that extensive fluoride use in children reduces their intelligence, then my case would seem to prove this wrong.
    Am I in favor of fluoride? I don’t have an opinion either way, most likely because I have yet to see actual proof that is acceptable to me from either side in supporting their claims. However, I am my own proof that the claims of this article may not be true.


    • For someone who claims to have a Ph.D. & likely genius-level IQ, it is astonishing that you know NOTHING about the epistomology or methodology of science. If you knew, you’d know better than to generalize from an anecdotal case (yourself) to pontificate about the causal relationship (or lack thereof) between fluoride and intelligence.

      Liked by 1 person

  8. Studies keep proving that fluoride is bad, not a nutrient, not healthy for humans to consume, and people keep on denying ’till they die from their skeletons fluorsis-ing to bits (osteoperosis? I suspect it’s actually osteo flurosis.) couldn’t that be considered proof that fluoride lowers IQ in adults as well? Besides, has anyone bothered to see what happens to the fluorides produced from the aluminum mining industry?

    To supplement the material on puberty though Dr. Eowyn, I would like to remind that “hormonal birth control” by and large are utilized by a disturbing amount of the population, and that the synthetic hormones therein have been shown to not be fully metabolized by the women using them, thus being put out in urine… the trouble with that is that many cities do “water recycling” that takes that sewage, and puts those unmetabolized hormones back into the water that is then drank by others including children (The filters, or so I read for the water in these cases do catch a certain level of bacteria etc. but things like hormones seem to be able to pass through, this may also explain the perceived “racial” differences, ghettos aren’t as likely to have good water as say, rich parts of the city, or to be more precise, they aren’t as likely to have secondary filtration systems to deal with anything else, the rich sector probably gets high-end secondary filter things and such.)… I’d posit this is the other culprit for the early onset puberty, because if you combine the fluoride with the “partially metabolized pharmaceuticals” such as leftover estrogens from those birth control items (not to mention whatever else impacts biology, coming from the “treated” sewage in the water), you’ll get a population regularly dosed with powerful hormonal compounds and toxins, and the result isn’t hard to deduce.

    Also, another fact about fluoride, it was the main use of rat poison for many years, and was also outright rejected by the american academy of dental surgeons (I don’t recallif this was their exact name.) which oddly disappeared (I suspect they were “scrapped” for not supporting the agenda… but that is only a suspicion, of course.) after a short amount of time, being replaced by the american dental association, who were more “compliant”.

    In addition, there is this:
    Note the comments by the “cheerleaders” for fluoridation tend to all drone the same “poison yourself” garbage, with no degree of validation for their opinion other than emotional pandering or pseudo-scientific snark.

    Liked by 1 person

  9. I don’t want to take a hard “stand” on either side of this yet…BUT…I can tell you that I grew up on a rural PA farm with a water well…without fluoride introduced in any way…and, first drank fluroridated water between the ages of 12-30 in another state. At that end point, I moved to an isolated, rural, non-fluoridated area in Utah, where I raised my kids without fluoridated water. We were offered fluoride pills by our dentist, but, I thought fluoridated tooth paste was enough without adding a pill that I didn’t know much about in measure, dosage, outcome, etc.

    The BEST thing I ever did—–without flouridation consumed by my kids, was to have their teeth “sealed” against decay with a sealant that lasted until they were in their late teens. Neither of my kids had a cavity until after that seal had worn off, in their 20’s. Had NOTHING to do with fluoride (which we know, at a minimum, promotes pre-mature aging in skin and like structures…)


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