Recovery from dental concussion usually begins a few weeks or months after the injury, but there may be cases where the pulp fails to recover due to the severity of the situation and pulp necrosis occurs. Dental concussion is caused by light external force or chewing hard objects impact caused by periodontal membrane mild injury, clinical manifestations of the tooth has a mild loosening of knocking pain, generally in the weeks or months after the injury, the pulp began to recover, the response and continue to maintain the vitality of the pulp, if not handled correctly or the situation is serious, it may lead to pulp necrosis can not be restored. Generally, after a concussion, it is necessary to adjust the jaws, so that the affected tooth rests for regular review, to observe the pulp vitality, and if there are signs of necrosis in the pulp such as spontaneous pain or discoloration of the tooth’s crown, it is necessary to consider root canal treatment after examination.