The ADA, AMA, and FDA have their own agendas -- supporting fluoride and insisting it has no ill effects whatsoever. It appears to have nothing to do with scientific evidence since medical researchers all over the world are calling out the dangers of fluoride and most advanced countries have banned it entirely. Since it is used as an insecticide on fruits and fruit juice makers don't spend the money to wash the fruit before they make it into juice, store-bought fruit juices can be considered a health hazard. If you search carefully, even our government has found evidence of fluoride danger but has done nothing about it.
https://www.ncbi.nlm.nih.gov/pubmed/1815742
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