Daily use of salt water instead of water for brushing is a certain benefit, because the salt water can make the bacteria in the mouth dehydration and death, can alleviate the recurrence of mouth ulcers in the mouth, but the use of salt water should also be used with the toothpaste at the same time. Because toothpaste is a kind of friction agent, can clean off the plaque on the surface of the teeth, but there are some beneficial flora in the mouth, if you use a long time of salt water for brushing, it is possible to make the beneficial flora in the mouth also died phenomenon, resulting in dysbiosis of the flora in the oral cavity, caused by fungal infections. Saline gargling is mainly for patients who have herpes or ulcers in the mouth itself, and the time of use is usually around 1-2 weeks is the best. In addition to the antiseptic and antibacterial effects, the salt itself can also increase the whiteness of the teeth, and it is recommended that patients can use it for a short period of time.