Yeah, cavity prevention is a bad thing. Oh, what am I thinking?
Actually, flouride was piling up all over the place... it's a by-product of aluminum production... until a lone study found that it "fights cavities". That study was funded by ALCOA.
It's only uses before they started making us drink it? Insecticide and rat poison.
On a related note, it's been shown that persons with Alzheimer's disease have elevated levels of aluminum in their brains. Might be a coincidence... but hey, the government would never ever do anything that's not in our best interest, would it?