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2010-05-21 07:59:40 UTC

2010 (128)
teeth (3)

green (17)

If you shine a really bright light (in this case a 20mW laser) into a healthy tooth, it will illuminate the tooth evenly. In this case, you can see a sharp discontinuity on the far side. (It was easier to see in person; getting even a mediocre photo was tricky.) My dentist verified the tooth was cracked.