Recurrent oral ulcers belong to the clinical common disease, with repeated episodes of superficial oral ulcers as a typical feature, belongs to the Chinese medicine “mouth ulcers” category, Zhi Bai Di Huang Wan has nourishing yin and fire (nourishing yin and essence, reduce the fire) effect, can be the treatment of yin and fire (Yin and essence loss, the emergence of deficiency and hyperactive fire) type of recurrent oral ulcers, the specific use of drugs It is recommended to consult a professional physician or pharmacist. Zhi Bai Di Huang Wan (知柏地黄丸) is based on Liu Wei Di Huang Wan (六味地黄丸) with the addition of two heat-clearing medicines, Zhi Mu (知母) and Huang Bai (黄柏), which not only nourishes yin, but also reduces fire. It can be used to treat yin deficiency and fire exuberance, hot flashes (feverishness), night sweating (abnormal sweating after going to sleep, but sweating stops after waking up), dry mouth and throat, tinnitus, seminal emission, and short and reddish urination (small amount of urination with dark yellow color). It should be noted that it should be used with caution in cases of Qi deficiency with fever and actual fever; in cases of colds; and in cases of loose stools in spleen deficiency and Qi stagnation with fullness in the middle of the body.