Saline is used to clean wounds and is a very common method. If the wound is freshly injured and there are more impurities in the wound, such as the appearance of sediment-like things, the first thing to do is to use saline to rinse out the impurities inside, and then do the formal disinfection, you can bandage, but also do the wound clean suture. After the surgery, generally before sewing the wound must be rinsed with saline, and then do the wound layer by layer suture. In special cases, such as corneal injuries of the eye, saline rinsing of the wound can also be considered. Children who have mucous membrane injuries of the mouth or tongue injuries and do not cooperate with disinfection and cannot spit out the disinfectant solution by themselves can also be given oral saline as a rinse for the wound, which also has the effect of rinsing the mouth.