Yunnan Baiyao can be used as an adjunctive treatment for oral ulcers. Mouth ulcers are commonly seen in the clinic as recurrent aphthous ulcers, traumatic ulcers and cancerous ulcers. Recurrent aphthous ulcers can be healed without treatment; traumatic ulcers need to remove the traumatizing factors that caused the ulcers, such as bad restorations, root stumps and crowns, etc; and cancerous ulcers need surgical treatment. All three types of mouth ulcers are associated with varying degrees of pain and discomfort. Yunnan Baiyao belongs to the proprietary Chinese medicines, the drug has the effect of activating blood circulation and removing blood stasis, relieving pain, reducing swelling, etc. When used in the treatment of mouth ulcers, it can improve the local pain as well as swelling symptoms, and has a certain auxiliary effect on the recovery of mouth ulcers. Repeated mouth ulcers, it is necessary to go to the regular hospital in time, and under the guidance of the doctor to standardize the use of drugs, so as not to delay the condition.