Facial palsy reconstructive surgery is performed to restore a patient’s normal expression and smile. Many facial palsy patients do not know their smile type, so whether they are still themselves after reconstructive surgery is often a concern. Let me discuss the common types of smiles and how the surgeon chooses a reconstruction based on the different smile types. Smile types: corner of the mouth smile (Mona Lisa smile): is the main smile type, accounting for 67% of the population. The smile is caused by the contraction of the zygomaticus major muscle, the levator muscle, and the laughter muscle, resulting in an external upward displacement of the corners of the mouth. The corner of the mouth is displaced about 14 mm along the outer upper part (roughly along the line between the ear screen and the corner of the mouth, about 40° angle). Wang Chengyuan, Department of Otolaryngology, China-Japan Friendship Hospital Canine smile: external displacement of the angle of the mouth with lip lifting, accounting for 31% of the population. Contraction of the zygomaticus major muscle, the angle-of-mouth lifting muscle, and the laughing muscle, as well as the upper lip lifting muscle are importantly involved. Full-mouth smile (Hollywood smile): the full teeth are exposed when smiling, accounting for 2% of the population. The zygomaticus major, the levator angularis, the laughing muscles, and the upper lip lift are significantly involved, and the descending levator angularis is significantly involved. How to perform muscle reconstruction according to the type of smile: 1., corner of the mouth smile: for patients with corner of the mouth smile, power reconstruction must be fixed by suturing the transplanted muscle or tendon to the lateral corner of the mouth to form a lateral dominant pull. 2., Canine smile: For patients with full-tooth smile, when power reconstruction, the transplanted muscle or tendon must be sutured and fixed at the lateral corner of the mouth + the midpoint of the upper part of the ipsilateral orbicularis oris muscle, which can reveal the first molar after intraoperative lip lift. In addition to simple tendon transfer, fascia graft is often needed to lift the upper lip. 3.Full mouth smile: for patients with full mouth smile, temporalis-tendon transfer or free femoral thin muscle graft cannot reconstruct the movement of the affected descending orbicularis muscle. Therefore, for this kind of patients, it is necessary to combine the procedures such as anterior ventral transfer of the diastasis muscle and destruction of the contralateral descending coracobrachialis muscle to achieve bilateral lower lip coordination on the opposite side.