The maintenance time of a tooth with a root canal needs to be determined by the state of the patient’s mouth as well as the care of the tooth, and can usually last 5-10 years or 20 years, or even longer. Root canal treatment is one of the commonly used dental care methods, which mainly involves cleaning out the necrotic pulp tissues in the tooth with a root canal, and then filling the area of the affected tooth with medication in order to alleviate the pain of the tooth and inhibit the development of the disease. After having a root canal, it is important to maintain a good oral hygiene environment and pay attention to oral hygiene and cleanliness, which can effectively prolong the maintenance time. After the tooth has undergone root canal treatment, you should avoid biting objects with the affected tooth and avoid chewing too hard food for a long time to avoid causing other dental problems.