- " Thus, children in high fluoride areas had significantly lower IQ scores than those who lived in low fluoride areas." ( hoi AL, Sun G, Zhang Y, Grandjean P 2012. Developmental Fluoride Neurotoxicity: A Systematic Review and Meta-Analysis. Environ Health Perspect :-. http://dx.doi.org/10.1289/ehp.1104912, 8/16/12)