1. Salt water with mouth ulcers has antibacterial effect and can promote the healing of mouth ulcers. 2. Mouth ulcers are a kind of ulcerative injury that occurs in the oral mucosa, mostly seen in the parts of the mucosa that lack keratinized layer or poor keratinization. Mouth ulcers will cause localized pain when attacked, and in severe cases, the use of the mouth. 3. The treatment of mouth ulcers is mainly based on local treatment and improving immunity. Because there is bacterial growth in the mouth, oral saline will play an antibacterial role, so it will promote the recovery of mouth ulcers. If the ulcers are recurring and large in scope, you need to be alert to whether it is cancer or precancerous lesions, and you should go to the hospital for examination in time.