Last night was the premiere of Discovery Channel's Atlas 4D. Like Sunday night's Life, it is a slow-motion heavy look at our world, but with less animal porn and more geology porn.
In this clip, a group of African salt-miners is shown sharpening their teeth to fine points as a sign of toughness.
So, the recipe for do-it-yourself crocodile teeth is: Drink a whole bunch of Fluoride, then have some dude wail on your teeth with a blunt knife. Voila!