Apparently fluoride is SUUUPER DUPER healthy for ur teeth, but like, it'll also stain them brown if u get too much. So if there's a lot of fluoride in the water, it doesn't hurt u at all it just makes ur teeth stronger but also they can eventually turn brown. But they'll be super strong! Just not pretty. The condition is called Fluorosis or smth and its purely a cosmetic problem. Weird!