The duration of the tooth after root canal treatment is related to many factors, which vary from person to person, and also has a certain relationship with the doctor’s skill and whether or not to wear a crown, and cannot be generalized. Because the nutritional supply of a tooth is mainly the pulp, and root canal treatment removes the pulp, resulting in no nutritional supply to the tooth, the tooth becomes more fragile and prone to splitting. Some patients have a high biting force and a habit of chewing hard objects (such as peanuts, melons, nuts, etc.), which can increase the possibility of splitting the crown of the tooth and thus shorten its service life. The doctor’s technique has a certain relationship with the service life of the tooth after root canal treatment. Good root canal preparation, thorough root canal disinfection, and tight root canal filling can prolong the service life. A porcelain crown on a tooth after root canal treatment can protect the already fragile tooth tissue and prolong its service life. After root canal treatment, it is recommended to do crown wrapping. You should pay attention to the use and maintenance of the crown, have regular follow-up examinations, pay attention to keeping the oral hygiene clean and avoid chewing too hard food to prevent the crown from splitting.