Dead pulp teeth generally have the following symptoms: 1. A history of trauma. Usually, dead pulp teeth may have a history of impact or external injury many years ago. 2. No response to electrical vitality testing and no response to hot or cold stimulation. 3. The tooth is usually grayish brown or appears grayish black. 4. There is no low density image of the root tip on radiographs, and individual teeth may have apical inflammation. 5. Dead pulp teeth are prone to occlusion or tooth splitting. In this case, root canal treatment of the tooth is needed, and internal bleaching of the tooth is needed to change the color of the tooth, and porcelain crown restoration of the tooth is needed to ensure the fracture resistance of the tooth.