If it is purely dental, only the teeth protrude forward, the angle of the long axis of the teeth is tilted too much, your upper lip and around the nose is not bulging, if you are bony, then the teeth, maxilla and around the nose are bulging forward, the lips can not wrap the teeth, so the teeth are exposed too much, this is most obvious when laughing, some gums are also exposed, which affects the image, the lower lip is also the same, because of the teeth, alveolar bone protrusion, the chin-lip groove becomes shallow or disappears, the chin-lip groove is an important sign of facial aesthetics if it disappears. The chin-lip groove becomes shallow or disappears because of the teeth and alveolar bone protrusion. The chin-lip groove is an important symbol of facial aesthetics, and if it disappears, it is very unattractive, and the side view is accompanied by a receding chin, a short chin, and the soft tissue of the chin often looks tense when it is closed, which is the characteristic of bony protrusion. In addition, you can use a straight ruler to connect the tip of the nose – upper lip – chin to try to see, normal these three points can be connected in a line, if not even in a line, usually the chin can not be connected in a line, this means that your aesthetic line is not normal, indicating that you have a protrusion of the upper jaw, the lower jaw receding. In addition most of the patients are accompanied by small chin deformity, some of them also have nocturnal snoring symptoms. X-rays can observe shortening of the mandibular ascending value, or shortening of the condylar neck, flattening of the condylar process, or even absorption of the condylar head, and some patients also have joint popping and pain, as well as widening of the mandibular angle and hypertrophy of the bite muscle. For very mild bony protrusion, you can also simply extract the front molars and then go through orthodontic treatment to be effective, but you have to go to a big specialized dental hospital, not to a personal clinic, lest the treatment fail due to lack of experience. There are also some private orthopedic hospitals that often advertise in the media that they can operate directly without orthodontics. Patients must be careful in their treatment, because the effect of surgery without orthodontics is discounted. If you are moderate protrusion, then you must go to a professional and experienced university college of dentistry orthodontics and oral and maxillofacial surgery consultation, through the orthodontic orthognathic joint consultation, to develop a treatment plan, this deformity treatment fails most often, most patients start to go to the orthodontic consultation, without the maxillofacial surgery consultation and then choose pure orthodontic treatment, or the orthodontist told the patient to surgery, the patient is afraid of surgery The patient was forced to choose the simple orthodontic treatment because of the risk of surgery. The result is that after the orthodontic treatment is over, the effect is not good, and then return to the maxillofacial surgery to request surgery, the follow-up treatment of such patients is the most difficult, especially the orthodontic extraction of four premolar teeth, the gap between the teeth is finished and found to be still jaws protrusion, this kind of pre-treatment failure brings very great difficulties to the later surgical treatment, and even lose the opportunity of treatment, so your initial sub-treatment plan is the most important, do not easily do orthodontic treatment. Especially extraction orthodontic treatment must be careful, to get both the surgeon and orthodontist to see before making a decision, so even simple orthodontic treatment should be consulted by a maxillofacial surgeon.