@Missustruth1776 Do people still know why it's done?

Fluoride is a nuclear waste byproduct.

Any country that fluoridates its water, only does so because it's a good way of squeezing more money out of the citizens by selling to them what would otherwise be waste.

This is also how you can tell which countries definitely have nuclear weapons programs.
If they fluoridate their water, it's either them, or their bigger neighbor that has a nuclear program.

That doesn't mean other countries don't have nukes, it just shows you who definitely does.