Why do humans have canine teeth? Patrick McGannon, Surprise, Arizona All primate species have them, says Sabrina Sholts, a curator of physical anthropology at the Museum of Natural History.

Narrator: Lions have them, hippos have them, and even you and I have them: canines, those long, pointy front teeth. They're actually the longest teeth in the human mouth. So what are these long ...

But how does the number of teeth a dog have compare to the number that humans have? Do dogs have more or less teeth than a human? And do dogs lose their teeth like humans do? These are all valid ...