The removal of an impacted tooth is recommended even though it is painful. If a wisdom tooth erupts well and is not painful, it is a normal tooth and there is no need to remove it. However, an impacted tooth is a tooth that cannot grow out, and its growth is difficult due to soft or hard tissue resistance. This type of teeth will be easy to form a gap around the crown of the blocked, the deposit of fine average and food debris, thus forming wisdom teeth pericoronitis, and cause greater pain to the patient, at the same time the blocked teeth will also have a tendency to grow forward, may encroach on the neighboring teeth, so that the neighboring teeth caries and lead to the crowding of the entire tooth row.