Tooth enamel regenerates naturally.
Why it is true
Tooth enamel does not regenerate. Once worn down or damaged, it does not grow back, unlike bones. That is why dental hygiene is so important to preserve enamel throughout life.
Source: Journal of Anatomy
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This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.