Salt should not be sprinkled on the wound in the case of mouth ulcers, which require scientific medication including gargles and dispersions. Spreading salt on a mouth ulcer wound can cause severe pain and may aggravate the local injury, possibly causing infection, so the operation of spreading salt is not advisable. Gargles such as chlorhexidine gargle, ciprofloxacin liquid or 1% povidone-iodine solution can be used for mouth ulcers. In addition, you can use ice boron powder, oral ulcer powder, etc., can reduce the external stimulation, reduce the pain of the wound, and promote healing. If mouth ulcers are serious, you should go to the hospital in time for examination and use the above medications as prescribed by your doctor.