The best time to correct the protrusion of the jaw is determined by the specific type of protrusion of the jaw, generally the earlier the better. There are two main types of ingrown jaws: dental and bony. In this case, the upper and lower jaws develop normally, and functional orthodontics can be started at the age of 3-5 when the milk teeth are fully erupted to relieve the restriction of the lower jaw on the upper jaw teeth. After the permanent teeth erupt at the age of 12-13, functional orthodontics can be performed again and dental traction treatment can be carried out. At this stage, the child is at the peak of growth and development, which can limit the development of the lower jaw and reduce the symptoms of mandibular protrusion. Second, the bony jaw is usually hereditary and can be traced back to the medical history. Usually the mandible is overdeveloped or the upper jaw is underdeveloped, and orthognathic surgery is required after the age of 18 when the mandible is basically fully developed. The treatment of ingrown jaws is a sequential treatment and requires preparation for a protracted battle. Once discovered, the diagnosis and treatment should be carried out at the earliest possible time at a regular specialist hospital or regular hospital dentistry department.