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Calcium Fluoride is what is usually found naturally in water but the cheaper, Hexafluorosilicic Acid, is dumped in our drinking water and its not even similar to "calcium fluoride". Hexafluorosilicic Acid is a highly toxic chemical, that has a laundry list of ailments and diseases to go along with it. According to DR. Hardy Limeback's research, most American cities are purchasing an industrial grade source of fluoride to fluoridate drinking water. It comes from smokestack scrubbers that produce phosphate fertilizer, its cheaper than the pharmaceutical grade. He explains, "Tragically,that means we're not just dumping toxic fluoride into our drinking water. We're also exposing innocent, unsuspecting people to deadly elements of lead, arsenic and radium, all of them carcinogenic. Because of the cumulative properties of toxins, the detrimental effects on human health are catastrophic." But we drink it, bathe in it, wash our clothes and dishes in it without hesitation. Artificially fluoridated water is not beneficial to our health and naturally occurring fluoride is not essential for ANY living thing, and that should be common knowledge.