Osseous Diastema is a condition in which the upper jaw is underdeveloped or normal and the lower jaw is overdeveloped, showing three types of antimandibular teeth, or three types of malocclusion. The most obvious manifestation of osseous dentofacial is its facial shape, which is concave or crescent-shaped. Usually, the treatment of bony Class III malocclusion is recommended at the age of 17-18 years old. By going to a specialized hospital and seeing a professional doctor for pre-surgical orthodontic treatment, the main purpose of which is to improve the compensation of the teeth and to make a more accurate analysis of the future surgery and increase or decrease the amount of bone. Bony Class III Diastema, usually starts after the preoperative orthodontic treatment is done and after complete growth and development, the best age for surgery is around 18 years old for females and 20 years old for males, and then the surgical procedure, i.e. orthognathic surgery.