> for no reason the reason is that fluoride is a byproduct of the production of aluminum. the scientist who discovered that fluoride supposedly helps prevent cavities just happened to work for alcoa. he made this discovery in the '30s when aluminum production was starting to really ramp up and alcoa was starting to have huge amounts of fluoride that they needed to deal with. there were already starting to be complaints about them simply dumping it into the environment, because it easily leached into water supplies. but in the '40s and '50s they used this "research" to convince local governments that they needed to start adding fluoride to the water supply for health reasons.  now this former waste product and potential pollutant was another product that could be sold for profit.
United States