Mouth ulcers sprinkled with salt are generally not useful, but may cause pain, aggravate the ulcer surface, make the ulcer surface larger and affect the healing. Mouth ulcers are mainly localized treatment, with drugs that promote healing, pain relief, anti-inflammatory and antiseptic. There is no research to show that using salt can treat mouth ulcers, but instead may cause pain, aggravate the ulcer surface, make the ulcer surface larger, and affect healing. Therefore, in the case of mouth ulcers, patients are not recommended to use salt directly on the wound for treatment, which may have an aggravating effect on the ulcer. If there are mouth ulcers, it is recommended to consult the hospital in a timely manner, under the guidance of the doctor for targeted treatment and therapy.