Humans can’t grow new teeth. But we’re not alone. Most mammals can’t. But many reptiles and fish can grow hundreds, or even thousands of new teeth in a lifetime. The reason has to do with how reptiles and mammals evolved differently over 300 million years ago.
Following is a transcript of the video:
Humans need dentists. It’s a fact. In 2017 alone, Americans spent $124 billion on dental visits. And an estimated 90% of adults in the US have fillings.
But many animals don’t have this problem. Because they
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