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A tooth (plural teeth) is a undersized, calcified, whitish form ground in the jaws (or mouths) of innumerable vertebrates and used to sever down food. Some animals, surprisingly carnivores, also take teeth in behalf of hunting or for defensive purposes. The roots of teeth are covered by gums. Teeth are not made of bone, but rather of multiple tissues of varying density and hardness.
The unrestricted make-up of teeth is similar across the vertebrates, although there is respectable modulation in their form and position. The teeth of mammals drink deep roots, and this decoration is also found in some fish, and in crocodilians. In most teleost fish, how, the teeth are attached to the outer rise of the bone, while in lizards they are fixed devoted to to the inner come up of the jaw alongside harmonious side. In cartilaginous fish, such as sharks, the teeth are attached by means of rough ligaments to the hoops of cartilage that accumulate the jaw.
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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).