N95 masks can prevent most larger particles and can have efficient filtration of viruses and bacteria. In the process of using this mask, if it is reused, special attention should be paid to the following points: 1, whether the use process is to a very complex environment, or whether it is in direct contact with patients of the new coronavirus. If you have direct contact with the patient and have been severely contaminated, this mask is not recommended for reuse; 2, if you only go to a relatively simple environment or open environment without being contaminated, this mask can be reused the next day. But after use must be cleaned and disinfected, using thermal disinfection methods, such as through ultraviolet light irradiation mask two sides, in order to play a role in killing and sterilizing. Or you can use dry heating methods, such as heating and baking with a heater, or hot air blowing directly with an electric hair dryer, which will also play a role in killing the virus. Content source: Dr. You Lai