Generally disposable masks will be sterilized, and can be discarded after use, try not to use them twice. Masks are generally sterilized during the preparation process, and ordinary gauze masks can be washed and reused if you want to use them several times. However, gauze masks cannot prevent the spread of viral droplets. Gauze masks will only have a simple blocking or defense effect on steam or objects with relatively large particles. So now masks generally do not consider their own disinfection, even if there is a good disinfection method, masks in the disinfection of the defensive effect will be greatly reduced, so people try to use disposable masks. For medical surgical masks, they can be discarded after more than 4 hours of use. Content source: Dr. Yurai