The shape of the mandible determines the shape of a person’s face. An enlarged mandible will appear as a wide face, known as a square face, accompanied by varying degrees of bite muscle hypertrophy. Mandibuloplasty is the premier surgical technique for clinically remodeling trapezoidal and square faces, which are rectified to create a goose-egg and melon face that meets people’s aesthetic standards. With the development of the plastic surgery industry, science and technology are constantly updated, so that the plastic surgery technology is increasingly advanced and more and more methods are applied to the surgery of the mandible. I. Composition of the Mandible The mandible is divided into the body and the ascending branch, with both sides of the body united at the center. There are two bony projections above the ascending branch of the mandible, the posterior one is called the condyle and the anterior one is called the coronoid process, and the concave margin between the two is called the mandibular notch. The point where the posterior border of the ascending branch intersects the inferior border of the mandible is called the angle of the mandible. In the middle of the medial surface of the ascending ramus there is a foramen called the mandibular foramen, and this foramen extends downward and forward in the mandible in a canal called the mandibuloglossal groove. The mandibular portion of the jaw consists of three main parts: the chin, the mandibular ramus, and the angle of the mandible. Whether the jaw is beautiful or not often depends not only on the degree of hypertrophy of the mandibular angle, but also on the shape of the mandible. Second, the cause of jaw angle hypertrophy As teenagers eat snacks and chewing gum and other foods too much, it will cause jaw hypertrophy, night grinding teeth can also be the cause of jaw hypertrophy. These all make the lifting jaw muscle group transition hammering, enhance the jaw angle area of the muscle and and bone good development, resulting in jaw angle hypertrophy. Bone hypertrophy of the angle of the jaw, the transitional development of the biting muscle protrudes from the cheeks on both sides, the situation varies from one candidate to another, and both reasons, bone-based or muscle-based, can lead to jaw hypertrophy. Meanwhile, mandibular hypertrophy may also be affected by genetic factors, such as the family has mandibular hypertrophy, their children have a higher chance of having this condition. The enlarged jaw angle is often accompanied by biting muscle hypertrophy, and the face shape of the candidate is wider. Third, the jaw plastic surgery methods and precautions Internal incision method: surgery from the mouth, first cut the oral mucosa to expose the mandibular angle periosteum, after sufficient separation, the mandibular angle bone will be revealed, the use of appropriate tools for the interception of the mandibular angle bone, the cross-section for smoothing treatment, and then haemostasis and sutures and other work. The advantage of the internal incision method is that there is no scar left on the face after surgery. However, the surgery is more difficult and the risk of surgery becomes greater, and the postoperative recovery period is correspondingly longer. Intraoral incision cannot remove cheek fat and large biting muscle at the same time, postoperative care of the oral cavity is complicated, no brushing of teeth for one week after surgery, no massage of the jaw after removing the stitches to avoid compression of the bone to affect the recovery. Extra-oral incision method: The surgery is performed in a relatively hidden position at the lower edge of the mandible, the skin surface is cut open to fully expose the biting muscle, the biting muscle is partially excised, and if the applicant’s mandible is relatively hypertrophied, the mandible is excised and smoothed with a bone file, and then the periosteum, muscle and skin are finally sutured together one layer at a time. The extra-oral incision method is easy to operate, and during the surgery, the parts are exposed sufficiently for precise resection. At the same time, the cost of surgery is low, which is easily accepted by the candidates, and the candidates recover faster after the surgery. Disadvantage, some candidates will have surgical marks on their face. Combined internal and external incision: The incision is made inside the mouth and in the jaw angle, which is convenient for removing the enlarged jaw angle, and it is also more accurate and convenient for intercepting the jaw angle bone, and it is also convenient for the biting muscle removal for those with enlarged biting muscles, and it is convenient for the combined internal and external incision. After the operation, the patient recovers quickly and the traces of the operation are not obvious. Fourth, jaw surgery in plastic surgery in the progress of the study of 3D printing in jaw plastic surgery 3D printing technology in orthopedic transplantation, manufacturing bionic models and plastic surgery and cosmetic surgery and other fields have an important role. 3D printing technology is a discrete superposition as the principle of manufacturing technology, the method through the assistance of computer technology, ceramics or powdered metal, etc. will be bonded to make arbitrary shapes of the items produced, which has the advantages of high production accuracy, high precision, production, and high precision, and the ability to produce a variety of products. It is characterized by high production accuracy, production methods, automation and material utilization. With the development in recent years, 3D technology has been widely used and has been increasingly emphasized in medicine. Candidates can fully improve the facial asymmetry in traditional surgery after surgery, and the implanted artificial bone has good compatibility, so that the basic functions of chewing and biting will not be affected. There will be no postoperative complications, and the restoration effect is better, which is favored by the majority of beauty seekers. Endoscopic technology has a wide range of applications in the treatment of human diseases. The application of endoscopic technology in surgical plastic surgery has promoted the development of plastic surgery technology. The application of endoscopic technology in surgical technology is characterized by little harm to the beauty seekers, low incidence of postoperative complications, and fast postoperative recovery, which gains the trust of plastic surgery seekers. The application of endoscopic technology only plays a role in the opening of the surgeon’s surgical career, but has no effect on the surgical technique and process Tips: With the increasing development of plastic surgery technology, the risk of plastic surgery is also decreasing. However, candidates suffering from serious medical diseases, such as heart function defects, liver and kidney function abnormalities and other conditions, or suffering from oral diseases and other people are not suitable for jaw angle plastic surgery. The pursuit of beauty is understandable, but it is important to make choices based on your own conditions. The use of appropriate surgical methods can improve the safety and accuracy of the surgery, which in turn reduces the risk of surgery for the candidate. It makes the prospect of techniques and applications related to jaw plastic surgery broader.