Oral commissures are complex structure when lost or injured, they present a complex reconsructive challenge. Between March 1998, and March 2001, thirty five patients were admitted to Plastic, Reconstructive and Burn unit, Mansoura University Hospitals. Patients had bilateral full thickness burn at the corners of the mouth leading to microstomia. Commissuroplsty was done . Procedures include release of contracture, dissection of orbicularis oris muscle. Muscle ends were sutured to form framework of oral opening. Defects at the commissures were covered with bilateral double rhomboid mucosal flaps from the cheek. Patients were followed up for one year. This technique gives goals of commissure reconstruction both functionally and aethetically. Also it creates mobile lip segment that moves dynamically and symmetrically with facial expressions.