Rotten mouth is considered to be caused by mouth ulcers, keratitis, chronic lipitis and other diseases. This kind of disease is not recommended to use prescription treatment, it is recommended that patients follow the doctor’s instructions to use general treatment, medication and other ways of treatment. 1. Mouth ulcers: If you have mouth ulcers that cause mouth rot, patients should keep the mouth clean, you can follow the doctor’s instructions to use watermelon cream, mouth ulcers and other drugs sprayed on the ulcer site, to promote the recovery of ulcers. 2. Keratitis: If the patient’s mouth is rotten because of keratitis, it may be caused by pathogens such as Staphylococcus aureus and Candida. It is recommended that the patient for the pathogen corresponding treatment, such as bacterial infection can be prescribed topical erythromycin ointment and other antibiotic drugs, to play anti-inflammatory effect of sterilization. 3. Chronic lipitis: If chronic lipitis leads to rotten mouth, patients should maintain lip hygiene, avoid licking lips. If the lips are flaky and dry, you can apply antibiotic ointment to the affected area, such as gentamycin ointment, to achieve the anti-inflammatory effect. It is recommended that patients with rotting lips go to the hospital for treatment, and the use of medication should be in accordance with the doctor’s instructions after clarifying the cause of the disease.