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Expert Evaluation by Tim Wright DDS, MS <br /> I address this issue under IQ but again it is critical to point out that exposure dose matters. One <br /> review on this topic stated fluoride exposure through drinking water was associated with a reduction in <br /> IQ but the studies cited were comparing optimal water fluoride levels to known toxic levels (10ppm in <br /> some communities).' Even at these extremes it is not clear that there is an association with IQ reduction <br /> that is caused by fluoride ion exposure. Many times, these populations (all were outside the US) have <br /> increased exposures to aluminum, lead, mercury and other well-known and well-characterized <br /> neurotoxins. There are numerous communities and populations around the world drinking fluoridated <br /> water that is excessive (compared with current US water fluoridation level recommendations) and there <br /> are not conclusive studies showing those populations have a diminished IQ or increased rate of <br /> neurological dysfunction unless the levels are well-above recommended and at levels known to be toxic. <br /> References: <br /> 1. Choi AL, Sun G, Zhang Y, Grandjean P. Developmental fluoride neurotoxicity: a systematic review <br /> and meta-analysis. Environ Health Perspect 2012;120(10):1362-8. <br /> [This space intentionally left blank] <br /> 40 <br />