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This is my whole point. Fluorine is an ELEMENT, and fluoride is its ion. There can be no difference between one ion and another. The terms "natural" and "aritficial" fluoride is nonsense.

The problem is very simple, very commonplace, and one that leads to all sorts of errors--he, like most people, is deficient in his understanding of chemistry. That's easily remedied. Something not so easily remedied is a belief that one's earnestness or fervency of belief somehow compensates for being wrong in matters of fact. Such a person is almost beyond hope because of his inability to distinguish any common objective standard outside of himself that can be appealed to from his hopes, wishes, and dreams. It's sort of like a Mafalda cartoon in which Miguelito was shown that his thumb held out in front of him alongside a distant cathedral appeared to be taller than the cathedral. Mafalda asked him why this was so. He said, "Because it's my thumb and it's very important to me."