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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 form start in the jaws (or mouths) of many vertebrates and used to defeat down food. Some animals, particularly carnivores, also use teeth repayment for hunting or instead 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 ordinary structure of teeth is alike resemble across the vertebrates, although there is of distinction converting in their show up and position. The teeth of mammals have deep roots, and this design is also create in some fish, and in crocodilians. In most teleost fish, how, the teeth are fastened to the outer rise of the bone, while in lizards they are fixed devoted to to the inner interface of the jaw by way of one side. In cartilaginous fish, such as sharks, the teeth are attached beside cold ligaments to the hoops of cartilage that form the jaw.