Mouth ulcers can use iodized glycerin. Iodized glycerin is a commonly used mucosal disinfectant and sanitizer, the main active ingredient is iodine, iodine has strong oxidative properties, can kill local bacteria, viruses, microorganisms, for oral ulcers localized topical application of iodized glycerin is conducive to local sterilization, anti-inflammatory, and promote healing of ulcerated surfaces, so the use of iodized glycerin treatment of oral ulcers has a better effect. However, mouth ulcers are caused by a variety of reasons, including mechanical trauma mouth ulcers, immune-related inflammatory mouth ulcers, and some may be associated with infection and nutrient deficiencies. Therefore, the treatment of mouth ulcers, on the one hand, symptomatic treatment, on the other hand, we must actively search for the cause of the disease, only to remove the cause of the disease in order to reduce the recurrence of mouth ulcers. Local treatment can use antibacterial and anti-inflammatory drugs, because once the mouth ulcer localized infection, it will be very difficult to heal, if the infection is controlled, the mucous membrane part originally has a very strong repair force, usually in 1-2 weeks, can be healed on their own, so the anti-infection treatment is also more important. However, if the effect of iodized glycerin alone is not good, it is still necessary to change other drugs in time for treatment.