If the tooth is black in the middle, depending on the degree of blackness, the following treatment options are available: 1. If the black part of the tooth is not damaged to the nerve, the tooth can be restored to a healthy state by removing the decaying mass and performing resin filling treatment. 2. If the nerve has been damaged in the large part of the tooth, root canal treatment is needed to remove the necrotic nerve and infected material first, and then perform restoration treatment when the inflammation is completely eliminated. The restoration treatment is carried out under the condition of complete elimination of inflammation. The restoration can be made into inlays, high inlays or all-ceramic crowns to restore the function of the tooth.