Saliva does have a certain disinfectant effect, but only for the wounds in the mouth, the body skin damage or trauma is not this disinfectant effect. 1. Saliva is saliva, which contains certain lysozyme and has a certain sterilization effect. Saliva also has a buffering and rinsing effect on teeth. Saliva inside a large number of mucin substances as well as a variety of digestive enzymes, able to inhibit the action of bacteria, so when there is a wound in the mouth, generally are not easy to infect. 2. When the body skin damage or trauma, the saliva also contains a lot of bacteria, can not do saliva is sterile, especially after eating, due to the impact of food chewing and other factors, but also constantly dilute saliva. In this case, the saliva will be applied to the wound area, the body skin damage or trauma is not sterilized, may also increase the chance of infection of the wound wound. For wounds that occur, patients are advised to go to a hospital operating room as soon as possible for treatment. The wound can be cleaned and disinfected by using disinfectants such as hydrogen peroxide and povidone-iodine to reduce the chance of infection.