The indications and contraindications for dental implants are divided into the general health condition and the local alveolar bone situation. Contraindications include: 1) serious endocrine metabolic disorders, such as uncontrolled diabetes, if the blood glucose is higher than 8.5mmol/L, it is not possible to do dental implants, otherwise it is likely to increase the possibility of failure; 2) blood system diseases such as red blood cell or leukocyte blood disorders, and coagulation mechanism disorders, can not do dental implants; 3) cardiovascular system diseases such as myocardial infarction within six months 3, cardiovascular diseases such as myocardial infarction within six months, or long-term use of special drugs that affect the ability of coagulation or tissue healing, such as aspirin, which can cause severe bleeding after surgery; 4, systemic immune diseases, excessive addiction to alcohol and tobacco, and psychiatric patients are not eligible for dental implants; 5, patients during pregnancy, patients subject to local conditions of the oral and maxillofacial area, are also temporarily not eligible for dental implants. The indications are as follows: 1. Patients with missing single teeth, multiple teeth, or even missing teeth in the whole mouth can have dental implants; 2. Patients who have special requirements for the aesthetics of dentures can also consider dental implant restoration; 5, the remaining teeth around the missing teeth have problems and cannot do traditional dentures, can also do dental implant restoration.