Why do sharks lose so many teeth?

Fun Fact: Sharks lose between 20 000 and 30 000 teeth in their lifetime, mainly while feeding on prey and they simply grow new ones.Why do they lose so many teeth? No root: Shark teeth are loosely attached to the gums, unlike humans whose whose teeth have deep roots that anchor them firmly in place.
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Видео Why do sharks lose so many teeth? канала Fossil Finder Sue