Disposable masks can be sterilized with hair dryer, but there are requirements and stress. According to the research report, the disposable medical mask after use can be wrapped in fresh-keeping bags for home use, and then treated with the highest grade vertical back and forth blowing by electric hair dryer. It can be used again 30 minutes later, without affecting its original filtering and retention effect, and can inactivate the contaminated virus. At the same time, we should pay attention to the problem of who, where and when to use this disposable mask sterilized by hair dryer. Because disposable masks are only suitable for one-time use, if such masks are used in hospitals or crowded places, there are certain safety risks.