Modern orthodontics has evolved from correcting the position of the teeth to achieving harmony between functional stability and aesthetic improvement of the craniofacial structures, which was made possible by applying a multidisciplinary approach to the planning and implementation of orthodontic treatment combined with orthognathic surgery.This article describes the case of a 17-year-old patient with a skeletal form of Class II malocclusion, shortening of the branches and the base of the lower jaw. The plan of preoperative orthodontic treatment included normalization of the position of the teeth on the upper and lower jaws, alignment of the occlusal planes. Second phase of treatment was a single-jaw operation (sliding osteotomy of the lower jaw, genioplasty) and then postoperative orthodontic correction, followed by the removal of braces and the fixation of retainers. As a result of the treatment, the skeletal Class I was achieved, the occlusal plane was completely corrected, which improved the function of the dentofacial system system and the aesthetics of the face.