Tooth extraction is the surgical removal of a tooth that can no longer perform oral functions, using general or local anesthesia. It is the most widely used procedure in oral and maxillofacial surgery as well as a means of treating certain dental diseases. What are the indications for tooth extraction? 1.Dental lesion The tooth can be extracted if the dental tissue is severely decayed or damaged and cannot be restored and utilized by the existing restoration means. If the crown is severely damaged but the root can be used by pile core or root cap after treatment, it should be preserved by all means. Some cryptocracks can be considered for retention after certain treatment. 2, periapical disease periapical lesions can not be cured by root canal treatment, apicoectomy and other methods can be extracted. It should be noted that the recovery of periapical lesions takes some time medical education|education.com collects and should be judged carefully. 3, periodontal disease Advanced periodontal disease, periodontal bone tissue support is largely lost, the use of conventional and surgical treatment has been unable to obtain the stability and function of the tooth. 4.Dental trauma Crown fracture can usually be preserved after treatment. Crown root fracture should be considered based on the location of the section under the gingiva, the degree of looseness, periodontal tissue condition, fixed conditions, etc.; also can be retained after crown lengthening and other surgical improvement conditions. A fracture of the middle 1/3 of the root is generally an indication for extraction. Apical 1/3 fracture can be observed after treatment. If the tooth is dislocated or semi-dislocated, the tooth should be reset and retained if the dental tissue is basically intact. 5.Misaligned teeth The teeth that affect the function, aesthetics, cause adjacent tissue lesion or adjacent tooth decay and cannot be restored to normal position by orthodontic methods can be considered for extraction. 6.Extra teeth Extra teeth often cause eruption obstruction or misalignment of normal teeth, resulting in malocclusion, which is often an indication for extraction. 7.Embedded teeth and interrupted teeth The indications for tooth extraction also include root resorption of adjacent teeth, pericoronitis, malocclusion, and caries of adjacent teeth should be extracted. In adolescent patients, orthodontic treatment can be used if there is an obstructed permanent tooth. Some of the obstructed teeth can also be utilized by means of dental implants.