Fluoridated water is a scam. In a side by side comparison between two towns in upstate NY, the people in the town without fluoridated water did not have noticeably higher incidents of tooth decay or cavities than those in the town with fluoridated water. Even among kids there was no noticeable difference.
In fact, fluoride is a toxin. It calcifies arterial walls, it affects the thyroid, causes ADHD and can actually make you dumber. Your kidneys excrete only about 50% of the toxin. The rest accumulates in your teeth, bones and glands. It's even been linked to certain cancers.
Then you have unscrupulous industries that have been known to send aluminum tailings out as "fluoride powder". All it is, is a way for industry to get rid of a waste product and make money doing it.