>>7016054Just how much fluorine is being added, and how much it affects health. The effects aren't fully known and the human body deals with the excess far worse than in case of iodine.
Yes, nutjobs make it into some kind of conspiracy/disaster/poisoning while the reality is at worst that your bones will get some 5% more fragile as you grow old, although even that is unlikely.
In other words: there are good indications, but no solid proofs that it's harmless.
