There is no evidence that salt has a therapeutic effect on mouth ulcers. Salt as a condiment can provide nutrition and may have some antiseptic effect, but it cannot be used to treat diseases. 1. The main component of salt is sodium chloride, which has some nutritional value to the human body. The sodium ions decomposed from salt can change the osmotic pressure of cells and have a certain killing effect on bacteria, but its effect is limited and generally cannot achieve the effect of treating ulcers. 2. The etiology of mouth ulcers is still unclear, in addition to bacterial infection may also have psychological factors, immune factors, endocrine factors and other influences, the current anti-inflammatory, analgesic, to promote the healing of the symptomatic treatment of the main, the use of salt instead of ulcers may be more stimulation, aggravate the pain and so on. If mouth ulcers occur, it is recommended to go to the hospital in time to receive regular treatment.