Objective To evaluate the clinical effects of Fu Fang Ya Tong Ding on treatment of gingivitis and pericoronitis. Methods 120 clinical patients with gingivitis or pericoronitis were randomly divided into 3 groups（40 patients in each group）. After routine rinse treatment for all patients, patients in the test group were treated with Fu Fang Ya Tong Ding, patients in the positive group were treated with iodine glycerol, while that time patients in the negative group received no treatment anymore. Ten minutes after treatment, visual analogue scale（VAS）was used to record the severity of pain for each patient. 3 days and 7 days later, pain and inflammation degree were also recorded by pain three - degree scoring method and index of gingivitis. The total treatment effects were evaluated under a comprehensive clinical treatment standard. Results 10 minutes after treatment, 40.0% of patients in the test group had almost no pain, while no obvious reduction of pain was found in the control group. 3 days, 7 days after the treatment, 92.5%, 95.0% of patients in the test group had no pain, and 55.0%, 90.0% of patients in the positive group had no pain. In the negative group, there were 47.5% of patients which pain was still remained in 7 days. 7 days after treatment, gingival index in the test group reduced by 25.0% and 42.8% compared with the positive and negative groups（P
