Children lose their baby teeth when their adult teeth come in. Most people will grow 32 adult teeth. But many people don't keep all of them. Many people will remove four of them: their wisdom teeth. Wisdom teeth are four "extra" teeth. No one really needs them. They grow behind all the other teeth, at the top and bottom and at the left and right sides of the mouth. These teeth can cause pain when they appear. They can even grow in sideways, pushing all the other teeth out of line. If this happens, a dentist will recommend removing the wisdom teeth. Dentists often suggest this for teenagers and people in their twenties. Drugs help the patient feel less pain while the teeth are taken out. Then, the patient must keep his or her mouth very clean while the mouth heals itself.