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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).

A tooth (plural teeth) is a cheap, calcified, whitish structure found in the jaws (or mouths) of various vertebrates and occupied to sever down food. Some animals, explicitly carnivores, also partake of teeth in behalf of hunting or owing defensive purposes. The roots of teeth are covered by means of gums. Teeth are not made of bone, but fairly of multiple tissues of varying density and hardness.

The ordinary systematize of teeth is alike resemble across the vertebrates, although there is of distinction converting in their fabric and position. The teeth of mammals get serious roots, and this pattern is also create in some fish, and in crocodilians. In most teleost fish, regardless how, the teeth are spoken for to the outer outwardly of the bone, while in lizards they are fastened to the inner surface of the jaw by way of harmonious side. In cartilaginous fish, such as sharks, the teeth are joined by cold ligaments to the hoops of cartilage that type the jaw.

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