The time of pulpal necrosis after traumatic tooth injury varies, but it usually occurs in about 1 month, but there are also slow cases, such as 6 months or 1 year. Therefore, it is recommended that patients should be reviewed regularly after a traumatic tooth injury, and the vitality of the pulp should be measured within a month or so. If the vitality of the pulp is significantly reduced or has disappeared, root canal treatment should be performed in a timely manner. For some completely dislocated teeth, the chance of pulp necrosis is very high, and for longer dislocations, it is recommended to undergo root canal treatment for replantation. Therefore, even if a traumatized tooth is not painful in the short term, it is necessary to see a doctor regularly for review, because it is likely that the vitality of the pulp will be lost unknowingly and pulpal necrosis will occur, which will cause an increase in inflammation. Therefore, it is important for patients to visit the dental hospital regularly for review after the occurrence of dental trauma. Generally speaking, the pulp vitality will be measured for the first time, and if there is no problem, it is recommended to come for a review once a month; if the pulp is sluggish or if the pulp vitality is not present, it should be treated in time. If the pulp is sluggish or if the pulp is not vigorous, it should be treated in time. After root canal treatment, a crown restoration can restore the function of the tooth.