People who have seen the movie “Wong Fei Hung” must remember that Wong Fei Hung had an apprentice called Tyrant Tooth Su, with that mouthful of tyrant teeth, I believe few friends think he is a handsome man. Normal people can’t see their teeth when they shut up. What’s the matter with the teeth? This involves the alignment of the teeth, our teeth are arranged in an arch shape inside the mouth, which is called the dental arch. In general, the upper jaw arch is larger than the lower jaw arch, which is expressed in the front teeth area, that is, the upper jaw front teeth should cover the lower jaw front teeth, this cover should have a certain range, if the distance is too large, it is called deep coverage. The so-called “bruxism” means that the distance of the maxillary front teeth over the mandibular front teeth is too large when shutting up, so that the maxillary front teeth are exposed outside the lips, which is also called deep coverage of the front teeth in medical terms. So, how is the formation of the “blunt teeth”? We know that teeth grow in the upper and lower jaws. Abnormalities in the relative positions of the upper and lower teeth and the upper and lower jawbone can cause “bruxism”. If the position of the jawbone is normal and only the upper jaw teeth are crowded and protruding, the treatment is relatively simple and can be solved by general orthodontic treatment. However, more often than not, it is caused by the abnormal position of the upper and lower jaws. If the position of the jawbone changes, the position of the teeth will also change, so we can think of “bruxism” as the relative forward position of the upper jawbone. Relative to whom? Just as we learned in junior high school physics, movement must have a reference, where the position of the upper and lower jaws constitute a relative reference relationship. So three situations are formed: the first situation is best imagined: the mandible is in a normal position and the maxilla is protruding; the second is the maxilla is in a normal position and the mandible is receding, which is the relative forward position of the maxilla; the third is the maxilla is protruding and the mandible is receding, so that the position of the maxilla is more forward. In the case of abnormal jaw position caused by “bulging teeth”, orthodontics alone usually cannot achieve the best cosmetic effect. It is necessary to combine orthodontics with jaw surgery to move the displaced upper or lower jaw to a relatively normal position, so that the teeth can be straightened and the face can be improved, “killing two birds with one stone”.