Tooth is a hard, calcified structure found in the jaws (or mouths) of many vertebrates and used to break down food.
The term "tooth" also refers to:
1. Any of the projecting parts on a comb, saw, zip, or gear
2. A liking or taste for something particular ("sweet tooth")
3. Power or effective means of enforcement ("give the law some teeth")
4. In botany, the pointed projections on the margin of a leaf