Tooth decay is tooth decay, if it is rotten and empty, it may fall off naturally, but it will be accompanied by many complications, so it is advisable to extract it as soon as possible. The rotten tooth will become very fragile, and the tooth may be broken during the process of eating and chewing, which seems to be a natural loss, but in fact, only the crown of the tooth is broken, while the root of the tooth is still lurking in the alveolar bone with a large amount of bacteria. This “shedding” will not only cause the adjacent teeth on both sides to tilt in the direction of the missing tooth, crowding the position needed for future denture restoration, but the bacteria-laden roots may lead to periapical inflammation and even periodontal disease, resulting in the resorption of the alveolar bone. The resorption of the alveolar bone is the biggest obstacle to the restoration of teeth later, especially when dental implants are needed. Therefore, when tooth decay occurs, the patient should be treated by a dentist as soon as possible to determine whether the affected tooth can be retained. If it is determined that the pulp chamber floor has been eroded, it does not need to be retained and should be extracted as soon as possible. In addition, after the extraction sockets heal in 1-3 months, depending on the state of the alveolar bone, movable denture, fixed denture or implant denture restoration can be performed, which is beneficial to restore the chewing function. Once the tooth decay occurs, it is recommended that the patient can undergo relevant examination in dentistry, such as taking dental film, to determine the apical situation of tooth decay and carry out targeted treatment.