Facial asymmetrical deformity refers to the different size and shape of the two sides of the face or incongruity, with left-right facial asymmetry as the main manifestation, normal people also have slight facial asymmetry, while people with complete symmetry on both sides of the face do not exist. The cause of facial asymmetry is still unclear, but it is thought to be the result of the combined effect of genetic and environmental factors. Based on the craniofacial structures involved, they can be classified into dental, functional, bony, muscular and soft tissue asymmetries, which are mostly used in clinical practice. For simple dental asymmetries, they can be treated by orthodontic means, including asymmetric extraction, distal displacement of molars, lamellar incision, and other space development with traction to correct the skew. For functional asymmetries caused by temporomandibular joint disorders, lateral chewing, and malocclusion, they can be corrected with the help of orthodontics, and also with the help of occlusal plates. For bony deformities, orthognathic surgery, such as condyloplasty, mandibular distraction osteotomy, mandibular body osteotomy, and mandibular ascending osteotomy, can be used. For muscular asymmetry, Botulinum toxin type A injections can be given, and the doctor will inject different amounts according to the size of the bite muscles on both sides, so that the volume of the bite muscles will be reduced to a different degree to achieve the purpose of face slimming and face correction.