At a time when masks are in short supply, if they are not stained or broken, they can be used for a longer period of time or reused as appropriate. People can hang the mask in the ventilation, shade, can also be properly folded inside, pad paper on a clean table, or put in a dry paper bag. However, it is not recommended to disinfect used masks by boiling, alcohol spraying or UV lamp disinfection. These operations will destroy the filtering layer on the surface of the mask, resulting in a decrease in the breathability and anti-bacterial and anti-toxic ability of the mask, which will not play a protective role.