Sharks often lose their teeth when they bite into prey. In their lifetime, they may go through thousands of teeth. In many species, the sharks grow rows of teeth, not just one row like humans. This is so that when the shark loses a tooth, a new one can move into place. Therefore, the shark is always growing teeth so it will never run out of teeth to attack prey with.
A shark’s skeleton is almost entirely composed of cartilage rather than bone. Cartilage doesn’t easily fossilize because it decomposes before tissue can be replaced with minerals, so shark’s skeletons almost never fossilize. Shark teeth, however, are composed of dentine and enamel, which fossilizes much more easily. Also, sharks replace there teeth with new ones every 8 to 10 days; so teeth are frequently disposed of.
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