A tooth (plural teeth) is a undersized, calcified, whitish build start in the jaws (or mouths) of many vertebrates and worn to defeat down food. Some animals, explicitly carnivores, also partake of teeth in behalf of hunting or in place of defensive purposes. The roots of teeth are covered by means of gums. Teeth are not made of bone, but to a certain extent of multiple tissues of varying density and hardness. The general structure of teeth is nearly the same across the vertebrates, although there is considerable variation in their show up and position. The teeth of mammals get esoteric roots, and this decoration is also found in some fish, and in crocodilians. In most teleost fish, however, the teeth are attached to the outer outwardly of the bone, while in lizards they are fastened to the inner surface of the jaw during a man side. In cartilaginous fish, such as sharks, the teeth are attached beside perplexing ligaments to the hoops of cartilage that form the jaw.