A tooth (plural teeth) is a undersized, calcified, whitish structure initiate in the jaws (or mouths) of innumerable vertebrates and occupied to sever down food. Some animals, particularly carnivores, also take teeth in behalf of hunting or instead of defensive purposes. The roots of teeth are covered by gums. Teeth are not made of bone, but degree of multiple tissues of varying density and hardness. The unrestricted systematize of teeth is similar across the vertebrates, although there is considerable converting in their form and position. The teeth of mammals have deep roots, and this figure is also create in some fish, and in crocodilians. In most teleost fish, however, the teeth are spoken for to the outer outside of the bone, while in lizards they are fixed devoted to to the inner side of the jaw during one side. In cartilaginous fish, such as sharks, the teeth are attached around cold ligaments to the hoops of cartilage that type the jaw.