Mouth ulcers on the gums can use mouthwash to relieve inflammation and promote healing, such as chlorhexidine gargle, borax gargle, etc., as follows. 1. Chlorhexidine gargle: the main ingredient is chlorhexidine, with a broad-spectrum bactericidal, bacteriostatic effect, in the mouth ulcers during the onset of local application, can reduce the incidence of ulcers, duration and severity. 2. Borax type gargle: the main ingredients are borax, sodium bicarbonate, liquefied phenol, glycerin. It is weakly alkaline, can dissolve corrupt tissues, has antibacterial, antiseptic, disinfectant, cleaning and other effects, applicable to the treatment of oral ulcers, children, the elderly, pregnant women, lactating women should be used with caution. The above drugs should be used under the guidance of a doctor, it is recommended to go to the hospital in time to receive early professional treatment.