Why Humans Can’t Regrow Teeth

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