The angle of the jaw consists of the mandibular branch of the lower jaw and the body of the jaw, which is symmetrical on the left and right side of the face (when normal) and usually requires plastic surgery if the angle is too large to be aesthetically pleasing. Mandibular surgery is a plastic surgery procedure to change the outer plate of the human mandible, which is the outermost plate of the ascending part of the mandible, equivalent to the attachment surface of the bite muscle. A significant portion of the population is hypertrophy of the outer plate, while the angle is not necessarily hypertrophic, which is the Asian face shape. In Europeans, the outer plate of the mandible is inward (concave), so the face looks quite thin and small. Aesthetic standards of the jaw angle: For a long time, research on improving the shape of the face has been much appreciated. This is because the shape of the face has a great relationship with the beauty of the face, and an ideal face shape can leave a good first impression. If the face shape is not ideal, even if the conditions of the five senses are good, sometimes the beauty of the appearance will be lost, resulting in a significant depression in the psychological and social adaptation of the individual. Face shape as a person, a certain behavior and cultural characteristics of the appearance of signs, in different countries, different nationalities, different age levels have different cosmetology connotations. In our country, it is traditionally believed that the oval face shape, commonly known as melon face or duck egg face, is the most ideal. Especially for women is more important, because only this face shape, whether from the front or from the side, are the proportion of coordination. And. The jaw angle is concealed and the profile line is smooth, which has the aesthetic advantage of curved lines and can fully reflect the beauty of curves. On the other hand, as we Asians, the forehead bone and cheekbone are not as prominent as Westerners, and the fine part of the face is more delicate, only the five features set off by the oval face shape are the most beautiful. The oval shape of the face is the most beautiful, and even if you don’t dress up, it gives you a sense of beauty and gentleness. In other words, it can fully reflect the natural beauty. At present, with the rapid development of the national economy, people’s living standards are also improving. The pursuit of beauty and admiration for beauty has become a social fashion. Through social influence, people are always changing their beauty-seeking behavior according to the dominant pattern in the culture, and always want their looks, especially their face shape, to meet the current recognized standards of handsome men and women. That is why the oval face shape is commonly sought. In particular, the expectations of the employing side are now climbing. As a result, people with non-ideal face shapes such as short face, side and bilateral asymmetry are sometimes treated coldly in terms of job hunting, education and spouse selection. As a result, there is a growing number of people who want to change their face shape. According to the results of a survey on the face shape of 12-year-old elementary school students in Beijing, less than 10% of the population has an oval face shape. However, the number of people with short faces is as high as 25%. In addition, 36% of the total number of students showed bilateral facial asymmetry. The rest of the population also showed varying degrees of disruption in facial coordination and symmetry. This means that only a minority of the population has an ideal face shape, while those who do not have an ideal face shape are common. Modern aesthetics considers “harmony” to be the highest form of the three elements of beauty. First of all, the harmony of vertical direction is one of the regular expressions of the face shape of beauty. Some people believe that the height of the lower 1/3 of the normal face and the middle 1/3 of the face should be approximately equal. Some people think that the height of the lower 1/3 should be close to the height of the middle 1/3. But in any case, the lower 1/3 of the face must have enough height to make the expression natural. This is one of the important foundations of beauty. If the height of the lower 1/3 of the face is significantly smaller than the height of the middle 1/3 of the face, a short face impression will be formed. It is commonly called “short chin” or even “no chin”. The soft tissues of the chin tend to compensate for the protrusion of the chin, the fullness under the lip, the loss of the normal curve of the red lip, and a series of aging states. It is mostly seen in people with deep bite and heavy tooth wear, short facial syndrome and congenital small jaw, as well as jaw development disorders caused by childhood trauma. The so-called short facial syndrome, mainly from clinical impressions, is highlighted by the short facial aspect facial shape, which was considered unchangeable without surgical correction in the past. On the other hand, facial harmony also requires width coordination. The width of the middle of the face (bilateral zygomatic arch spacing) is about 1.3 times the width of the lower part of the face (bilateral mandibular angle spacing) in beautiful people. If the width of the lower face is equal to or greater than the width of the middle face, the width is not in tune. From the frontal view, the bilateral mandibular angle is overly abducted, and the chewing muscles are enlarged and expanded, and the front teeth are too deep and too tight, giving a sense of aspect. The angle of the jaw angle from the side is less than the normal average value of 123 degrees, or even becomes a right angle. For men, this can be said to be masculine, but for women, it completely loses the spirit and beauty. Symmetry is another regular expression of facial beauty, which can give people a sense of balance and stability, and bring beauty and pleasure. There are no people with absolute symmetry on both sides of the face, but asymmetry is a deformity if it exceeds a certain limit, which will destroy the beauty of the face. It is only second to the destruction of facial coordination. Introduction to jaw angle plastic surgery methods: 1, jaw angle plastic surgery is generally used intravenous resorption of general anesthesia, the surgery is completely painless in. 2, extra-oral incision: is to make a 3-5 cm incision at the jaw angle to remove the jaw angle. Advantages: the surgery is performed under direct vision, which is safer; no complicated equipment and instruments are needed, and the masticatory muscle can be partially cut away at the same time. 3.Post-ear incision: A 3-4 cm incision is made behind the ear to remove the angle of the jaw. Advantages: the incision is relatively hidden and the operation is relatively simple. 4.Intra-oral and extra-oral combined incision: applying a 3cm-4cm incision inside the mouth and two 0.5cm-0.8cm size incisions under the jaw, it is very convenient to remove the enlarged jaw angle, and at the same time, the outer plate of the mandible and the jaw margin can be removed or ground, and part of the bite muscle can be removed. Advantages: The procedure is very convenient and many beginners use this method. The marks of the submandibular microincision will be inconspicuous after a period of recovery. 5.Submandibular microincision: It is the application of a joint incision inside and outside the mouth to insert a tiny incision of 0.5 cm to 0.8 cm in the chainsaw to complete all the surgical procedures, the incision is under the lower jaw, and the incision will not be obvious after 3 to 6 months. Advantages: There is no intraoral incision in this method, so the surgery is less traumatic and the recovery after surgery is fast. 6.Complete intraoral incision: It is the best surgical method at present. It is the application of intraoral incision of 3 cm to 4 cm arc to remove the hypertrophic mandibular angle, and at the same time can remove or grind the outer plate of the mandible and the mandibular margin, and can remove part of the bite muscle. Advantages: Because there is only an intraoral incision for the entire surgery, no surgical scars will be left on the body surface, and the surgical trauma is much smaller compared to the combined intra- and extra-oral incision, and the recovery is significantly faster. The minimally invasive approach is also used because of the intraoral approach, which avoids the chance of damaging the facial blood vessels and nerves. The technique of surgery is more demanding. Precautions after jaw angle surgery: 1. Patients are required to stay in the hospital for 3-5 days for observation after jaw angle surgery. 2. Do not wash your hair within one week after jaw angle surgery. 3, jaw angle surgery after the head mask pressure bandage for 5 to 7 days, if no special circumstances can not be removed in the middle, such as the removal of the bandage should be timely, pay attention to check whether there is pressure bad skin, such as intra-oral wound placed drainage strips, then 48 hours after surgery dialed. 4.Prohibit any type of supplements and drugs that may accelerate blood circulation, reduce coagulation mechanism and affect wound healing, such as ginseng, aspirin, blood-boosting drugs, diet pills, menstrual regulating drugs, etc. If needed, consult with the surgeon. 5.After jaw angle surgery, eat liquid food until the fifth day, and try to avoid biting hard things within three months. 6, 6 hours after jaw angle surgery, start gargling with mouthwash until the removal of stitches. 7, three months after jaw angle surgery shall not do facial beauty massage, shall not rub the surgical area. 8, jaw angle surgery 7 days after the removal of the stitches, eat less spicy and stimulating food, try to semi-liquid food. 9, no smoking after jaw angle surgery.