Shark teeth are coated with acid-resistant fluoroapatite enamel which helps alleviate cavities. As you can see from the collage of photos below, shark teeth are arranged in neat conveyor belt of rows. Supposedly they can replace within a day of losing one. Sharks don't actually regrow teeth one by one but have multiple rows inside their jaw that are constantly regrown. When a tooth on the edge of the jaw drops out, the corresponding tooth in the row behind it moves forward to replace it.
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