Recently, we have been seeing many patients with ambiguous teeth requesting extraction, with maxillary cuspids being more common and some teeth growing outside of the arch, and parents coming in and requesting extraction of these teeth, thinking that everything will be fine as long as they do not interfere with other teeth. First of all, let’s talk about the significance of cuspids The cuspids are located at the corners of the mouth, and their labial surface is protruding from the labial axis ridge, with strong roots, which play an important role in supporting the bilateral corners of the mouth. Especially the maxillary cuspids, such as missing or misaligned protruding, can make the nasolabial sulcus collapse, deformation and affect the beauty of the jaw face. The crown of the cuspids is smooth on all sides, without gaps and grooves, and has a good self-cleaning effect, so the rate of caries is low. Because the root is long and stable, it can withstand large jaw force and stay in the mouth for a long time, so it is mostly chosen as abutment teeth when restoration. In addition to the third molar, the maxillary cusp is the most likely to be obstructed, the incidence is usually in the range of 1%-205%, often occurring on the palatal or buccal side, and the incidence is twice as high in women as in men. The majority of the ambulatory obstruction of cuspids is due to local causes, mainly the following: 1. incongruity between tooth size and arch morphology. 2. retention or early loss of milk cuspids. 3. abnormal position of the embryo. 4. congenital alveolar ridge cleft, 5. root adhesions. 6. cysts. 6, Cyst or tumor formation. 7, Curvature of the dental arch. 8, Medically induced factors. The orthodontic treatment for maxillary cuspids is generally divided into: 1. 2.Surgical opening, according to the full-mouth surface tomography and three-dimensional CT film to determine the location of the buried teeth and the direction of the crown and root using surgical methods to expose the cuspids. 3.Orthodontic traction. Therefore, extraction of buried cuspids is rarely chosen in treatment because it will affect the patient’s occlusal function and facial aesthetics, but if the buried cuspids are deformed or root-bone adhesions have occurred and cannot be moved through a period of orthodontic treatment or if internal or external resorption of the root occurs, extraction should be decisively chosen.