How many years can a broken tooth be used after reattachment is related to the size of the bite force of one’s own teeth, the way of restoration, etc. It can generally be used for more than six months, and the specific time varies from person to person. 1. Broken teeth may be after dental trauma after splinting the healed teeth, the use of time may be six months or a year or so, but often in the late need to do root canal treatment, and then crown restoration, but also may be for the crown fracture teeth for the core crown repair, if the oral bite is not big, eat less hard food, the use of time is usually can be more than a year. 2. But if their periodontal conditions are poor, and like to eat hard objects bite force, often shorten the service life of the tooth. Broken teeth after reattachment can be used for how many years the specific time varies from person to person, it is recommended that the daily maintenance of good oral periodontal conditions, can extend the service life.