If you have an oral ulcer, you can take vitamin B2 and vitamin C tablets. Traditional Chinese medicine for clearing away heat and toxic materials, such as oral liquid for clearing away heat and toxic materials, Niuhuang Jiedu tablets, Yinqiao Jiedu tablets, etc. You can also apply "Zhuhuang Powder" to the ulcer, which has local analgesic and anti-inflammatory effects, so that the oral ulcer will get better soon.
Usually, you should pay attention to eating more fresh vegetables and fruits, and you can also take vitamin B2 and vitamin C tablets in moderation every day, so that oral ulcers are not easy to get.