We've been fluoridating water since the 1950's. The science is similar to vaccines: they simply forgot to do the all-cause mortality and morbidity studies showing the benefits outweigh the harms.
At the AB 2098 event in Sacramento today, Jay Sanders of fluoridealert.org walked up to me and asked me, "Can I give you a book?" This is the sort of life changing question that got Robert F. Kennedy Jr. to realize that vaccines aren't safe. So after a 10 second hesitation to overcome my cognitive dissonance (since as we all know fluoridation must be safe since it is mandated everywhere ), I said yes, and I ended up with a copy of "The Case against Fluoride: How Hazardous Waste Ended Up in Our Drinking Water and the Bad Science and Powerful Politics That Keep It There." by Steve Kirsch