Mouth ulcers rubbed with salt are generally not very useful and can cause pain and discomfort, as well as potentially delaying the healing of mouth ulcers. 1. If the mouth ulcers with salt, salt may remain in the mouth ulcer wound, will not only change the cell osmotic pressure, but also stimulate the nerve endings, which will lead to mouth ulcers pain aggravation, but also delay the healing of mouth ulcers. 2. If itself is due to inflammation caused by mouth ulcers, you can also use salt water for gargling, can play a certain role in sterilization and anti-inflammatory. In addition, when the mouth ulcers, but also need to eat a light diet, try to avoid spicy and stimulating food, can be appropriate to eat vitamin-rich vegetables, fruits, but also pay attention to rest, strengthen the physical exercise, will help the recovery of mouth ulcers.