After the tooth decay occurs, it needs to be repaired, and the filling material which is more commonly used in the clinic at present, there is no problem to apply for 8-10 years. However, the premise is that during the treatment process, the decayed material must be removed thoroughly and the operation must be carried out strictly in accordance with the requirements, otherwise it is easy to occur for leakage and secondary caries after the operation, which will affect the use time of the dental material. In addition to this, patients should also pay attention not to chew hard food with the filled teeth in the process of application. Chewing hard food frequently can cause the filling material to fall off. For teeth that have undergone root canal treatment, a crown restoration must be performed after a week after the filling, otherwise there is a possibility that the tooth will be inadvertently split during the application process. After the crown restoration, you can chew food completely normally and there is no problem to apply it for 8-10 years.