Wisdom teeth are the third molars and the last four teeth to erupt in the mouth. They erupt between 17 to 25 years of age. A wisdom tooth that does not erupt fully into the mouth is called an impacted wisdom tooth
. An impacted tooth can erupt at a wrong angle and press against the adjacent tooth causing pain and swelling. If this happens, the impacted third molar is surgically extracted. If the impacted tooth has partially erupted, then the oral surgeon will make a simple incision and remove the tooth. If the tooth has not erupted at all and is covered with bone and gums, then the tooth is first exposed by drilling through the bone. After extraction, stitches are placed for the gums to heal and the wound to close.