If you have an ulcer in your mouth, it is not recommended to sprinkle salt on the ulcer, as sprinkling salt will cause local irritation to the ulcer surface, which is not conducive to the healing of the ulcer. People with mouth ulcers should eat light, easily digestible food, eat more fresh vegetables and fruits, take vitamin C supplements, or take vitamin C tablets or multivitamin tablets, all of which are beneficial to the healing of ulcers. You can apply watermelon cream spray, open-throat sword spray, stomatitis spray, etc. locally on the ulcer for local anti-inflammation, which is also beneficial to the healing of the ulcer. If the pain caused by the ulcer is obvious, you can apply local lidocaine gel to relieve the pain, or you can apply recombinant human epidermal growth factor to promote the healing of the ulcer. People with ulcers at the corners of the mouth should ensure regular habits, sleep early and wake up early, and do proper exercise to enhance the immune function of the body to prevent recurring ulcers.