The human face is composed of bones, muscles and various tissues, most people’s left and right faces will have subtle differences, which are not obvious and belong to the normal situation. If caused by congenital developmental insufficiency, but does not cause adverse effects on daily life and work, usually no adjustment is needed. If caused by other acquired factors, or congenital asymmetry is more obvious, can be selected according to the specific reasons for medical aesthetic plastic surgery, removal of factors affecting the face to improve the shape of the face, to reduce the left and right face asymmetry. First, the cause: 1, bad habits: patients have unilateral chewing, the habit of holding the face with the hand, as well as having a bad sleep posture, etc., may lead to left and right face asymmetry over time; 2, trauma: there was facial trauma in early childhood, can affect the facial development of the injured side, resulting in left and right face asymmetry, if trauma in adulthood, may be due to bones, muscles and other injuries when not timely treatment or Treatment effect is not good and lead to facial muscle atrophy, or facial bone fracture, etc., may also appear left and right face asymmetry; 3, disease: such as tumors, mumps, dental inflammation, etc., can make the left and right face asymmetry, appear size face phenomenon; 4, plastic surgery sequelae: some patients may be due to unsuccessful facial plastic surgery and lead to the appearance of left and right face asymmetry. Second, treatment: 1, medical plastic surgery: such as the left and right face asymmetry phenomenon is relatively mild, usually can choose to self-fat transplantation or injection of botulinum toxin for correction, if the asymmetric situation is more obvious, most need to go through surgery to improve, such as osteotomy, milling bone surgery, etc.; 2, remove the factors affecting: such as caused by bad habits, in addition to the above medical plastic surgery, but also need to change bad habits as soon as possible, such as try to chew on both sides in rotation or Common chewing, do not use hands to support the face, often change the posture of sleep, etc., to slow down or improve the situation of left and right face asymmetry. If it is caused by trauma, the trauma should be treated promptly and treated accordingly, and conservative treatment or surgery should be taken according to the severity of the fracture respectively. If it is caused by disease factors, the original disease should be actively treated and most patients can gradually recover after removing the effects of the disease.