"Recently, epidemiological studies have suggested that fluoride is a human developmental neurotoxicant that reduces measures of intelligence in children, placing it into the same category as toxic metals (lead, methylmercury, arsenic) and polychlorinated biphenyls"
Source: NIH paper was
published 4 1/2 years ago
https://pmc.ncbi.nlm.nih.gov/articles/PMC7261729/