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A tooth (plural teeth) is a undersized, calcified, whitish form ground in the jaws (or mouths) of various vertebrates and worn to sever down food. Some animals, explicitly carnivores, also take teeth for the purpose hunting or in place of defensive purposes. The roots of teeth are covered by gums. Teeth are not made of bone, but fairly of multiple tissues of varying density and hardness.

The unrestricted make-up of teeth is be like across the vertebrates, although there is considerable modifying in their fabric and position. The teeth of mammals have profound roots, and this figure is also create in some fish, and in crocodilians. In most teleost fish, manner, the teeth are spoken for to the outer surface of the bone, while in lizards they are fixed devoted to to the inner side of the jaw by harmonious side. In cartilaginous fish, such as sharks, the teeth are attached by cold ligaments to the hoops of cartilage that accumulate the jaw.

Children's tooth development begins while the baby is in the womb. Teething usually occurs between the ages of six and nine months. Children usually have their full set of 20 primary teeth (milk teeth, baby teeth or deciduous teeth) by the age of three years. At about the age of six years, the first permanent teeth erupt (push through the gum).