Oral fire can be solved by dietotherapy. Apples and pears in fruits have good functions of clearing away heat and reducing fire; Kiwifruit is rich in vitamins and is helpful for ulcers caused by excessive internal heat. Radish in vegetables also has the function of detoxifying and reducing fire. It's best to drink mung bean soup every day, which has the effect of clearing away fire and detoxifying. You can take some vitamins if you still can't get the good. Don't eat peanuts, oranges and other fruits, don't eat too much pepper, and don't use an electric mattress when sleeping at night. These are easy to get angry. Drug treatment includes: oral ulcer powder, ice shed powder, watermelon frost spray, etc.