We use our teeth to bite and chew food—the first stage in digestion. Babies start to get their first teeth, called milk or deciduous teeth, at about 6 months. By around age 2, children have 20 teeth: four central incisors, four lateral incisors, four canines and eight premolars. These teeth begin to fall out at around age 6, and adult, or permanent teeth, replace them.
Adults usually have 32 teeth: eight incisors, four canines, eight bicuspids, eight molars and four wisdom teeth. Wisdom teeth sometimes don’t appear until age 25, and in some cases, they never erupt through the gums.
Parts of a tooth
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