Wisdom Teeth Wisdom Teeth
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A wisdom tooth is in humans any of the usually four third molars, including mandibular third molar and maxillary third molar. Wisdom teeth usually appear between the ages of 17 and 25. Most adults have four wisdom teeth, but it is possible to have more—in which case they are called supernumerary teeth—or fewer—a condition called hypodontia. Wisdom teeth commonly affect other teeth as they develop, becoming impacted or "coming in sideways". They are often extracted when this occurs.