A tooth with an exposed nerve is usually not a direct filling. The occurrence of a tooth with a leaking nerve indicates that the lesion has invaded the pulp cavity of the tooth. At this time, if you directly fill the tooth, the filling material is easy to stimulate the exposed nerve, inducing pulpitis, may also lead to necrosis of the nerve. In severe cases, it may develop into periapical periodontitis, leading to destruction of the alveolar bone and loosening of the tooth. If an exposed nerve occurs, the tooth needs to be evaluated to see if it can be fully preserved. If the tooth can be completely preserved, it can be treated by pulp capping; if the symptoms are not relieved after pulp capping, a trial filling can be made by pulpotomy; if this does not solve the problem, a root canal should be performed before filling the tooth, and an artificial crown should be fabricated to be placed on the outside of the crown to prevent splitting by external forces or chewing. Patients with symptoms of exposed nerve of the tooth should seek medical attention in time to improve the examination, and then the doctor will choose the solution according to the specific situation.