The exposed nerve of the tooth is clinically common in two kinds of reasons, and the treatment methods of these two reasons are slightly different. If the nerve of the tooth is exposed due to the caries caused by the common clinical caries, it means that the nerve must have clear symptoms of infection, there is no other way but to extract the nerve and carry out systematic root canal treatment and tooth filling. Clinically, if the trauma of the tooth causes a part of the tooth to fall off and causes the tooth nerve to be exposed, it is necessary to check the size of the exposed nerve specifically. If the scope of the exposed nerve is very small, as big as a pin point, it can be considered to apply a special material to cover the pulp and cover the nerve for a period of observation. If there are no specific symptoms of the nerve, you can consider filling the tooth directly without root canal treatment.