The rubber tent is one of the necessary instruments for root canal treatment, it can effectively isolate the patient’s saliva, truly aseptic operation, is a strong guarantee of the success of root canal treatment. With the rubber tent, some highly configurable drugs can be used in the patient’s mouth, if there is no rubber tent, the consequences are unimaginable. Mei Xingcheng, Department of Stomatology, Jinan Hospital of Traditional Chinese Medicine, Jinan, China