Zhenbing Koukuining Guccal Tablets

1) Using placebo as control, preliminarily evaluate the efficacy and safety of Zhenbing Koukuining Lozenges in the treatment of mild recurrent aphthous ulcers (oral ulcers-heart and spleen heat accumulation syndrome). 2) Explore the reasonable dose of Zhenbing Koukuining Lozenges in the treatment of mild recurrent aphthous ulcers (oral ulcers-heart and spleen heat accumulation syndrome) to provide a basis for Phase III clinical trials