The teeth grow in the alveolar sockets and are covered with gingival soft tissue. The normal dental bed can show a certain degree of convexity like root-shaped protrusion, which is called physiological protrusion. Protrusion of the dental bed can be divided into local protrusion and overall protrusion of the upper and lower teeth. The causes of local protrusion are: the occlusal force point is concentrated in a certain tooth, generally seen in the cuspid and bicuspid areas, the alveolar bone in the tooth area bears too much occlusal load, the alveolar bone compensates for the hyperplasia, and the local dental bed protrudes; in elderly patients, when the gums age and atrophy, the alveolar bone also atrophies and absorbs, the bone of the tooth root is not absorbed, making the root base of the tooth shallow, the tooth elongates, and the root type protrudes obviously; local teeth When gum bleeding, gingivitis, and periodontal disease exist, gum atrophy, alveolar bone resorption, and tooth bed protrusion will also occur. The overall protrusion of the upper and lower teeth is mainly caused by genetic causes of malocclusion, common causes: An’s Class II malocclusion causing maxillary protrusion mandibular recession malocclusion, An’s Class III malocclusion causing mandibular protrusion maxillary recession malocclusion, which requires orthodontic treatment of malocclusion at the appropriate age. Any tooth bed protrusion should not be ignored, must be timely to the regular hospital dentistry to avoid due to miss the best time for treatment.