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Pulpitis is one of the common diseases indicated by the department of stomatology that is located in the tooth and contains abundant nerve vessels. In order to evaluate the pain degree and functional recovery of patients after treatment by visual analogue pain scale (VAS) and temporomandibular joint function score, a retrospective analysis was performed on 128 patients diagnosed with pulpitis who received root canal treatment in the department of stomatology from January 2020 to March 2021. The results show that 3%NaClO combined with 0.9% sodium chloride injection can effectively relieve the pain degree of patients after treatment, and the antibacterial effect is significantly better than 3%H2O2 combined with 0.9% normal saline. Meanwhile, it can effectively improve the temporomandibular joint function and reduce the recurrence rate, which has good clinical application value.