The course focuses on skeletal features of Class I, II, III malocclusions, complications of orthodontic treatments, the relationship between orthodontic treatment and normal occlusion characteristics, anatomical and functional occlusion criteria and temporomandibular joint, treatment methods for dental and skeletal features of Class I, II, III malocclusions and effect mechanism and types of fixed, removable, functional, extraoral, intraoral, expansion and retention appliances, methods of orthodontic diagnosis, treatment of dentofacial deformities and the differences of the orthodontic treatment between adult and children/adolescents, complications that may occur during orthodontic treatment and the measures to be taken for the prevention of complications, orthognathic treatment ,cleft lip and pale, RPE and retention treatment, impacted teeth and transposition, lack of lateral tooth, adult orthodontics, obstructive sleep disorder, and treatment.