Mouth ulcers smear salt is useless, salt can only supplement nutrients for the organism, can not treat mouth ulcers, but also may lead to irritation or aggravation of the ulcers, patients with mouth ulcers should take medication in a timely manner. Mouth ulcers patients in the wound smear salt is not effective, salt is seasoning, every 100g salt contains 99.9g, 0.1g water, edible salt can only be for the body to supplement the nutrients needed. Patients in the ulcer surface wipe salt not only does not have any role in the treatment of mouth ulcers, but also may lead to the ulcer surface becomes larger, the pain is more intense, the patient’s condition will be aggravated. Patients with mouth ulcers should seek medical treatment in a timely manner, patients can follow the doctor to use benzydamine spray, lidocaine aerosol and other pain medications, but also can use recombinant bovine alkaline fibroblast growth gel, recombinant human epidermal growth factor gel and other drugs to promote healing. When patients develop mouth ulcers, applying salt does not help. Patients should go to the hospital in time, follow the doctor’s instructions for medication, and should not use their own medication.