Teeth are items that are solely used as ammunition, despite their cateogorization as a "material" in the game's code. They can be a decent source of ammunition due to the fact that they are dropped off of many of the things you hunt to begin with, making them a viable albeit weak option.
It can be used as ammunition for the slingshot and the arbalest , with base damage of 15. When combined with the 1 damage of the Slingshot, it does 16 damage with the low arch of the slingshot. When used with the arbalest's 1 damage, it does 16 damage with the infinite linear shot of the arbalest.