With the progress of time and the development of science and technology, there are more ways to restore lost teeth in the oral cavity, among which the most popular are dental implants. In recent years, more and more patients have opted for dental implants, however, there may be some patients who know less about this treatment technology or have doubts about it. I. What is dental implant? Dental implant refers to a way of restoring missing teeth based on the substructure implanted in the bone tissue to support and fix the upper dental prosthesis. It consists of a supporting implant in the lower part and a dental prosthesis in the upper part. The implant is made of artificial materials (e.g., metal, ceramic, etc.) and is surgically implanted in the tissue (usually in the upper and lower jaws) and is firmly supported by the bone tissue, and the upper restoration is supported by a special device and connection. It is possible to obtain a restoration that is very similar to the natural tooth in terms of function, structure and aesthetic results. The use of allografts, animal teeth and metal materials to replace missing teeth has been documented as early as 4000 years ago in China, 2000 years ago in Egypt and 1500 years ago in the Inca Empire, and the rapid development of natural sciences in the early 19th century, when science, technology and knowledge became widely used in the medical field and people started to implant allografts to replace missing teeth. It was not until 1952, when Branemark discovered that titanium could produce a very strong bond with bone, and in the early 1960s, he began to research the use of titanium in dental implants, that the technology of dental implants began to develop rapidly. Today, this technology has become more mature and complete. The treatment process of dental implants includes: clinical examination and imaging, diagnosis and treatment design, surgery, denture fabrication and restoration, and maintenance of the implant and restoration. According to the time relationship between implant placement and extraction, implant surgery can be classified as immediate implant, delayed immediate (within 3 months after extraction) and delayed implant (3 months and longer after extraction). According to the time relationship between restoration weight-bearing and implant placement, implant restorations can be divided into immediate weight-bearing, early weight-bearing and delayed weight-bearing. With the development of oral implantology, the treatment period is being significantly shortened, and it is possible to wear implant dentures immediately after implant placement, or even immediately after extraction. Second, the advantages, indications and contraindications of dental implants Compared with traditional dentures, dental implants have many outstanding advantages: (1) chewing and aesthetic function is much better than many traditional dentures; (2) has a strong retention force and stability; (3) no damage to the adjacent natural teeth; (4) does not require the necessary abutments and rings for movable dentures, making patients more comfortable; (5) small size, no metal exposed, aesthetic, conducive to oral hygiene. (5) small size, no metal exposure, aesthetic, and conducive to maintaining oral hygiene. (6) It can effectively prevent alveolar bone resorption and gum recession. With the application of various oral implant techniques and bone grafting materials, the continuous improvement of implant systems, and the development of imaging and digital technology, patients with single tooth loss, multiple tooth loss and edentulous jaws can theoretically receive implant restoration treatment. However, there are some patients who are not suitable to receive implant treatment, for example: poor general health condition. Severe endocrine metabolic disorders, such as uncontrolled diabetes mellitus. Hematologic disorders such as erythrocytic or leukocytic hematologic disorders, disorders of coagulation mechanisms, etc. Diseases of the cardiovascular system that cannot tolerate surgery. Long-term use of special medications that affect coagulation or the ability of tissues to heal. Severe systemic immune disorders. Patients with excessive addiction to tobacco and alcohol, neurological and psychiatric disorders. Patients during pregnancy. Patients who are restricted by local conditions of the oral and maxillofacial area. The service life of dental implants depends on the strict surgical operation, the selection of implant system, the design and production of the restoration, as well as the correct and effective post-operative maintenance. Therefore, it is very important for patients to have the correct knowledge of dental implant maintenance. (1) Oral hygiene maintenance Consult your doctor, follow the doctor’s instructions, adopt the correct brushing method, and develop the habit of brushing your teeth every day and rinsing your mouth after meals to ensure good oral hygiene and prevent peri-implantitis. (2) Weight-bearing diet After the completion of the dental implant restoration, a gradual process of weight-bearing is required. Therefore, it is not advisable to eat hard and tough food for a short period of time after the surgery, so as not to affect the service life of the dental implant due to excessive loading of the dental implant. Pay attention to the protection of the artificial tooth root, do not chew with it, so as not to loosen the root, so that the newly formed bone around the root is affected, which is an extremely important issue to ensure the effect of the implant. (3) Regular review and maintenance During the process of good daily maintenance after the completion of dental implants, regular visits are also necessary, which is crucial for the maintenance of the effect of dental implants. Regular review of the dental implant is necessary to provide timely treatment for possible loosening of the mechanical parts of the restoration and peri-implant inflammation.