“a report from the world’s oldest and most prestigious medical journal, The Lancet, has officially classified fluoride as a neurotoxin, in the same category as arsenic, lead and mercury.”
Neurobehavioural effects of developmental toxicity
Dr Philippe Grandjean MD a b 
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, Summary
Neurodevelopmental disabilities, including autism, attention-deficit hyperactivity disorder, dyslexia, and other cognitive impairments, affect millions of children worldwide, and some diagnoses seem to be increasing in frequency. Industrial chemicals that injure the developing brain are among the known causes for this rise in prevalence. In 2006, we did a systematic review and identified five industrial chemicals as developmental neurotoxicants: lead, methylmercury, polychlorinated biphenyls, arsenic, and toluene. Lancet Abstract