In fact, there is no gold standard double blind scientific study showing fluoridation actually helps dental health (preventing dental caries). Even local studies show fluoridation in specific age groups of school age children doesn't work. There are many studies showing harm, however. Another point to consider regarding public health is that chlorinating drinking water is treating the water (which is a great idea if you live a few miles downstream of some city that dumps its sewage in the river upstream from your drinking water source). Fluoridating that same water treats YOU and that's medicating you (any chemical used to prevent a disease - dental caries - is a medicine) without your permission. We are fine with you choosing to use any medication you or your medical provider think appropriate - and that choice will likely be pharmaceutical grade whereas the stuff they've been putting in our water here is literally toxic waste containing many heavy metals - poisons in unknown amounts.