Orthognathic (jaw) surgery is a method of treatment administered by orthodontics and jaw surgery branches of dentistry to improve both functionality (chewing, speaking) and aesthetic appearance in the patients with severe jawbone abnormalities. 3D images of the patients the orthodontic treatment of which has been completed are taken to plan the surgical operation. The patient who had a recovery period of 1 month after orthognathic surgery operation would have an orthodontic treatment process of 6 to 12 months remai ned, as a final step. This treatment is a final treatment guaranteeing the permanent position of the teeth after the initial orthodontic and corrective surgical procedure performed. It is a surgical procedure used in those who have severe jaw bone disharmony and a corrective procedure used for adult patients who have a complete bone development. This procedure which can be performed for on both jaw bones when needed, is applied to the patients who have severe chewing, closing and speaking problems in facial area and problems about respiratory functions due to the disharmony of jaws and have aesthetic concerns about the facial area due to the jaws positioned too far forward or too far back. Correctly closing jaws and ideal rows of teeth have positive results in the appearance of the patient.  Better speaking, chewing, and breathing functions results in an improved quality of life.