Some people do not pay much attention to missing teeth in the mouth, especially missing 1-2 teeth. They think that if one side of the tooth is missing, they can use the other side; if the back tooth is missing, the front tooth can be used. In fact, if the teeth are not set for a long time after extraction, it will bring various effects to the whole oral and maxillofacial system: 1. The first thing is that you can’t bite. Sometimes individual teeth are missing, and long time without restoration will also affect the whole mouth due to the change of oral tissue. Often manifested as adjacent teeth to the gap tilt to narrow the gap, the jaw teeth elongation caused by early contact or interference, thus leading to bite function disorder. It is often caused by one tooth missing causing the disuse of one side of the tooth, and as a result periodontal disease and caries increase, so the view that one less tooth does not matter is not correct. 2, periodontal tissue lesion. If a tooth is missing for a long time, the adjacent teeth will be inclined to the missing tooth, and the jaw teeth will be elongated to cause food embedment, and then periodontal disease will occur. 3, missing front teeth often affect the aesthetics and pronunciation, language is formed in the oral cavity, front teeth mainly affect the accuracy of pronunciation of dental sounds (eat, poetry, know), labiodental sounds (divide, fly, put), linguodental sounds (de, special, difficult). 4. Missing teeth often cause lesions of the temporomandibular joint, and in serious cases, problems such as restricted mouth opening, joint pain, and joint popping.