1. Necrotic discoloration of the pulp of the left upper central incisor with mild elongation and labial tilt, mild gingival redness and atrophy, perfect root canal treatment and supragingival scaling. 2, Correct the angle and length of the affected tooth by tooth preparation and make a temporary crown. 3.The restoration was completed. In this case, the color of the central incisor was dark, and the color of the lateral incisor was normal. The transition of the color from the upper right central incisor to the upper left lateral incisor was paid attention to when comparing the color, and a certain gap of the gingival papilla was preserved, which made the restoration more natural and the patient was satisfied.