“But I think your second teeth form while you still have your baby teeth.”
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Well, I do not know, and too old to learn or worry about it.
My mouth has more gold then it has teeth.
It was my impression that fluoride affecting teeth was simply from contact, as in having it painted on the teeth by a dentist, or tooth contact with fluoridated water.
That is why I wonder why there would be much use in any treatments for kids with baby teeth.
Like me, you've reached metal age friend - Gold in your mouth, silver in your hair and lead in your a$$.