They are supposed to be able to tell from enamel wear at the back of the mouth, and supposedly trained to be able to recognise the damage caused by purging: it's said to be quite distinctive, caused by acid and whatever, but whether dentists are in fact all that knowledgeable, I don't know.
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That's why it's such a serious thing to ask a Centaur to stay for the weekend. A very serious thing indeed.
- The Silver Chair
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