In the eyes of most non-medical personnel, dentistry is just a department of tooth extraction, filling and veneering, but it is not! With the rapid development of medical science, dentistry is also playing an equally indispensable and huge role. Starting from the simplest tooth decay, if a tooth decay remains in the patient’s mouth for a long time, it may lead to serious complications such as gum inflammation, oral odor and even jaw bone osteomyelitis. In addition, if a tooth is missing due to tooth decay, tooth extraction, trauma, etc., and the tooth is not set for a long time, it will cause the adjacent teeth to tilt toward the gap of missing teeth and the opposite jaw teeth to elongate, resulting in local misalignment of bite, and the best time for treatment has been lost when you want to set the tooth. If there are sharp tooth tips and bad restorations (poorly designed dentures) in the mouth for a long time, they can irritate the oral mucosa and lead to ulcers that do not heal for a long time and can turn into tumors in serious cases. Therefore, these sources of irritation must be removed in a timely manner to prevent problems before they occur. For the restoration of missing teeth, there are three common methods: removable denture (removable dentures), fixed denture (porcelain teeth) and dental implants. Removable dentures are simple to make, low cost, but low chewing efficiency, and need to be removed and cleaned after each meal, which is extremely inconvenient to use and only suitable for some old and weak patients who are afraid of treatment. Porcelain teeth are beautiful, durable and accepted by most patients, suitable for the treatment of most tooth decay, tooth loss, tooth discoloration, etc. The disadvantage is that more teeth need to be ground. Dental implants are the most advanced international treatment method that has emerged in recent years. Patients with a single tooth, especially a single missing back tooth, are recommended to use dental implants for restoration, which can receive good long-term results. In conclusion, oral diseases should not be neglected, and problems should be seen in time, and the teeth should be brushed correctly and on time to maintain good oral health in general.