The classification of mandibular wisdom teeth There are two common clinical classifications: one is based on the relationship between the wisdom teeth and the long axis of the adjacent teeth; the other is based on the relationship between the wisdom teeth and the high and low positions of the adjacent teeth. 1, according to the wisdom teeth and neighboring teeth long axis relationship: common vertical, forward, horizontal, lingual and so on the following chart: 2, according to the wisdom teeth and neighboring teeth high and low position relationship is divided into high, medium, low three categories: higher than or flat in the adjacent tooth crown plane for high; lower than the cervical part of the neighboring teeth for low; between the two for medium. The wisdom tooth is the last tooth in the jaw, so it is not easy to clean when brushing and the local hygiene is poor, so inflammation of the gums around the crown can occur, called pericoronitis. This is the most common lesion that occurs after the eruption of a wisdom tooth. If the patient does not consult the doctor in time, it can lead to interstitial infection, resulting in facial swelling and pain, restricted opening of mouth, some patients will also have fever, and even form cheek fistula, which will not heal for a long time and bring great pain to the patient. 2, wisdom tooth caries because wisdom tooth is not easy to get good hygiene, wisdom tooth is easy to form cavity, can cause severe pain 3, adjacent tooth caries and periodontitis, there is a small gap between wisdom tooth and adjacent teeth, food residue can stay, long time can lead to adjacent tooth caries and periodontitis, as shown in the figure.