Deep overjet can be corrected by orthodontics, which requires different treatments according to the classification of malocclusion such as Class I, Class II and Class III. 1. Ankylosing Class I malocclusion: For normal neutral jaw relationship and deep overjet of front teeth, the problem of deep overjet can be improved by assisting the use of maxillary movable orthodontic appliances to elevate the height of alveolar bone of the back teeth and to keep the height of alveolar bone of the front teeth unchanged. 2. Ankylosis II: For the case where the molar relationship is in a near-midjaw relationship and the anterior teeth show a deep overjaw, it is necessary to carry out a full-mouth orthodontic treatment to keep the height of the anterior alveolar bone unchanged, and use the movable orthodontic appliance and implant impedance to depress the height of the posterior alveolar bone. 3. Anser’s Class III malocclusion: For the case of molar relationship in the distal-middle jaw relationship and deep overjet of the front teeth, it is relatively more difficult to straighten the teeth, and it is necessary to lower the alveolar bone height of the front teeth and the back teeth at the same time, and it is necessary to cooperate with the use of functional orthodontic appliances in addition to bonding of the fixed brackets. If the teeth have deep overjet, generally you need to go to a professional orthodontist in a regular dental clinic for evaluation before treatment, and you need to actively cooperate with the doctor’s guidance and operation in the process of orthodontic treatment.