Dental nerve injury is prone to inflammation, and common triggers include bacterial factors, immune factors, physical factors and chemical factors. 1. Bacterial factors: Bacterial infection is often the main cause of pulpitis, such as deep caries, heavy wear, traumatic factors and medical factors may lead to enamel destruction, which in turn leads to the invasion of bacteria through the exposed dentin tubules, pulp, periodontal pockets, as well as trainee infections and other pathways, inducing pulpitis. 2. Immune factors: antigenic substances invade the pulp or apical tissues, which can also cause specific immune responses, inducing pulpitis. 3. Physical factors: such as acute dental trauma and chronic trauma, as well as excessive temperature changes or high stimuli, including laser treatment, etc., can induce endodontitis. 4. Chemical factors: such as filling substances, bonding agents and etching agents, as well as aldehydes and phenolic disinfectants, may induce severe pulpal lesions and pulpitis. In addition, dental nerve damage has a certain degree of danger, it is recommended that patients need to receive regular treatment as soon as possible.