An impacted tooth is a tooth that has not fully erupted into the oral cavity. The tooth is still imbedded in the jawbone, under the gum tissue.
Unerupted or partially impacted wisdom teeth are common in the teenage years. Often there is not enough room for the tooth to fully erupt. Food debris can become trapped around the partially erupted tooth. The second most commonly impacted tooth is the canine, or cuspid.
Impacted teeth are most common during adolescence.