After dental trauma, a series of symptoms will appear: 1, common pulpal congestion, regardless of the severity of the trauma, generally according to the patient’s age, and its recovery is very relevant, to be closely observed on a regular basis; 2, temporary loss of pulp, also known as pulpal shock, when there is no response to vitality tests, but can be later to recover; 3, common pulpal necrosis, regardless of tooth dislocation or tooth fracture, it is likely to Pulp necrosis occurs, when root canal treatment is performed, and after treatment, crown restoration is subsequently performed; 4, root resorption occurs, such as internal resorption and external resorption of the tooth root, mostly seen in the case of root bone adhesions after tooth replantation, and many of these times will occur. Routine root canal treatment, and in the process of root canal treatment, calcium hydroxide is placed in the root canal to effectively prevent and stop further resorption.