Who died and made you the arbiter of Truth?

I provided sources, you didn't. Engage in a facts based debate or don't engage at all. Shallow dismissals have no place on HN. (by the actual site guidelines, not my made up declaration)

Fluoride is fine for cleaning your teeth, but not ingesting. Thankfully I don't have city water.

The amount in water is at a safe dilution and only conspiracy theory fear mongers say otherwise.