National Academies of Science for 2 straight years identified dozens of flaws in the meta analyses, data sets, mostly from China among populations relying on groundwater wells contaminated with industrial waste, leading to fluoride levels far above municipal drinking water. Here’s just 1 article:
The concentration of fluoride in water does not equate to an individuals dose from all sources. Fluoride is in the food supply - very high in tea, seafood, grape and soy products, in all infant formula and products made with mechanically de-boned chicken. Fluoride is neither essential or a nutrient
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Yes, at high levels, fluoride is a neurotoxin; however, it has been found both safe and effective as municipal water additive. https://ntp.niehs.nih.gov/sites/default/files/ntp/nasem/response202204.pdf