And just to be perfectly clear, fluorides are a cumulative neurotoxin that's stored in the body over time. Just like mercury and other heavy metals are.

It causes fragile, brittle bones, and is stored in the bones of people who don't take in enough calcium. It is chemically similar to calcium, but it is a corrosive, acidic toxin in the body. Tooth staining caused from fluorides is a common problem today, which was rarely a problem before the introduction of various forms of fluoridates in toothpastes and water starting in the late 1950s and early 1960s.

So while your fluoridated water supply might be perfectly safe in the short term (technically speaking) the ingestion and absorption of it over the span of years and decades can't possibly be safe due to long term exposure.