Following is a transcript of the video. 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 ...

Mice have four incisors, two maxillary (upper) incisors, and two mandibular (lower) incisors. Canine teeth and anterior premolars are absent—the toothless space between the incisors and molar ...

and a diverse array of teeth -- incisors, canines, premolars, and molars. In the early Cenozoic era, after the dinosaurs became extinct, the number and diversity of mammals exploded. In just 10 ...

Now let's see these pearly whites go to work. Look at the incisors and canines chop and tear that food from its source and right into your mouth. So pretty, yet so deadly-- to apples. Now phase ...