Ever since last year’s federal court ruling that the EPA must address the risk that fluoridated water poses to children’s developing brains, study after study has added to the evidence that early exposure to fluoride can be harmful for little ones. One systematic review and meta-analysis published earlier this year in JAMA Pediatrics is particularly notable. Its authors found that, across 74 studies, as fluoride exposure went up, IQ scores went down.
Then a few days ago, headlines began to deliver a seemingly opposite message: New research in Science Advances finds that fluoride might actually be good for your brain!
If you only skimmed headlines like those, no one could blame you for thinking that drinking fluoride could actually make you smarter.
But once you slow down and look at the study itself, the story isn’t quite so neat and tidy. Or definitive.
For their analysis, researchers used data from a large national health survey and combined detailed records of city fluoridation practices with measurements of naturally occurring fluoride in local groundwater. Participants were classified according to whether they had “sufficient” fluoride exposure through childhood, some exposure, or none at all. This info was then compared to performance on standard cognitive tests in both early adulthood and around age 60.
Within this specific, adult-only snapshot, the researchers found no evidence of harm. They also observed the one detail that the media really ran with:
We find that children exposed to recommended levels of fluoride in drinking water exhibit modestly better cognition in secondary school, an advantage that is smaller and no longer statistically significant at age ~60.
But this doesn’t tell us anything about the neurological effect of fluoride exposure during those prenatal and childhood years during which almost all documented neurodevelopmental risks have appeared. The study looked only at cognitive performance in the late teens and adulthood.
The study stayed in a small, well-defined corner. Lack of harm in a corner doesn’t tell you much about the rest of the house.
As intriguing as it is, this new study doesn’t really overturn anything. It looked at a single effect in a limited population. It’s much too narrow to be taken as “the final word” on fluoride’s overall safety.
Meantime, if you’re a patient of ours or a regular reader of this blog, you already know that you don’t need fluoride to help keep your teeth strong and healthy. Real prevention starts with diet. A nutrient-dense, low-sugar diet delivers what your body needs to remineralize your teeth naturally. It supports good gut health, as well – which is dynamically connected to the health of your oral microbiome.
Pair that with good home care, a healthy lifestyle, and regular dental visits, and you’ve got a real upstream solution. You’re strengthening the oral terrain instead of trying to make up for choices that can harm oral health.
That’s a thing that seldom makes headlines. “You can support strong teeth through diet, biocompatible hygiene, and lifestyle” just doesn’t hit the same as “fluoride may be good for your brain.” So what if the science doesn’t definitively prove that? So what if it goes against all the evidence that early exposure may indeed harm developing brains?
Strengthen the system. Support the body. Create conditions where teeth can thrive.
