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, sharp ...

Frightened babies expose their teeth; happy babies stretch their lips without extreme tooth exposure. Other primates expose their teeth with open mouth when threatened or with the mouth nearly closed ...

New research has uncovered differences in canine teeth between men and women. The discrepancies lie below the enamel in the dentine of the tooth, both in primates and humans, meaning that the ...