Methods Randomized controlled clinical study of THC was performed. 180 patients of dental pains by different causes were given the TCH to rinse the teeth for 30 seconds.

• 方法:随机选择各种牙痛患者计180例,用THC含漱30秒,10分钟后检查疼痛缓解度,3小时后再复查一次疼痛缓解持续时间。