If the incisors are black and decayed, first of all, we should take a film to check the depth of tooth decay and determine whether both teeth are decayed. After the diagnosis is confirmed, the decayed part needs to be ground out and blocked in pieces, and not to block two teeth together. The commonly used filling material is light-curing composite resin, which is aesthetically pleasing and is difficult to distinguish because it is similar to the color of the tooth. If the incisors are black and the decayed area is large, it is recommended to do veneer restoration or porcelain braces restoration after removing the decayed matter, which is beneficial to the sturdiness of the teeth and ensure the function of cutting and biting of the front teeth. If the tooth is decayed and there is hot and cold water pain or spontaneous pain, then it is necessary to do the nerve killing treatment, after killing the nerve, you can do the porcelain braces restoration, which can avoid the phenomenon of blackening or fracture of the tooth.