Comment by jandrewrogers

That study is taken grossly out of context. It doesn’t claim what people claim it does and even the study states that the quality of the data on which the weaker claim was made is suspect.

The bigger issue is that we have vast amounts of scientific data and empirical evidence around fluoride toxicity. People are injured and die due to fluorine exposure, we understand how it interacts with biology. Any mechanism of action that can support the hypothesis that fluorine causes brain damage necessarily invalidates all of this evidence and is difficult to explain as a matter of basic chemistry.

And then we have to explain why fluoride in water has this effect but the much higher levels of fluoride in food does not.

Fluoridating municipal water may not offer much benefit but there is no credible science that it is actually harmful. Large regions of the world have water that naturally has far higher fluorine content than municipal water and there is no evidence of IQ reduction in these regions either.