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You really can't rebuild enamel. Once enamel is gone, it's really gone. So as an adult, enamel has almost the same structure as bone. Once you lose bone, you can't really regrow it. Sometimes it's okay to just leave it alone because your enamel is thin so there isn't much you can do about it but if it's causing you sensitivity or pain, you may need either a crown or a dental filling to cover that up.
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