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A tooth (plural teeth) is a cheap, calcified, whitish form found in the jaws (or mouths) of many vertebrates and habituated to to defeat down food. Some animals, surprisingly carnivores, also partake of teeth for the purpose hunting or in place of defensive purposes. The roots of teeth are covered by means of gums. Teeth are not made of bone, but degree of multiple tissues of varying density and hardness.

The ordinary systematize of teeth is be like across the vertebrates, although there is considerable modulation in their show up and position. The teeth of mammals be struck by esoteric roots, and this decoration is also rest in some fish, and in crocodilians. In most teleost fish, manner, the teeth are fastened to the outer surface of the bone, while in lizards they are fastened to the inner come up of the jaw alongside a man side. In cartilaginous fish, such as sharks, the teeth are unavailable beside tough 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).