These pointed canines are caused by a developmental disorder. These are positioned too high and tend to protrude as the upper ...

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 Tip number one to keeping your dog's teeth clean and healthy: Let him chew. But not on just anything. First, make sure it's safe. No sticks, no rocks, and be careful about bones.