If the position of wisdom teeth is normal and there is enough space for eruption, they may not be extracted. If the position of wisdom teeth is abnormal and there is no enough space for eruption, and the third molar of the opposite jaw is not in the right position or has been extracted, then the wisdom teeth should be extracted, as follows. 1. Wisdom teeth that may not be removed: the wisdom teeth have normal position, enough space for eruption, can erupt orthodontically to reach the height of the neighboring teeth, and after removing the overlying gingival flap, normal occlusal relationship can be established with the maxillary teeth. 2. Wisdom teeth that need to be extracted: the wisdom teeth are in abnormal position, without enough space for eruption, and cannot establish a good occlusal contact with the opposite teeth, and the existence of wisdom teeth may lead to diseases of the surrounding hard and soft tissues, such as food impaction, caries of the neighboring teeth, and so on. It is recommended to go to a regular medical institution to receive professional treatment.