The protective mask can be reused without throwing it away at one time. Only in individual cases, when there is concern that repeated use of masks will lead to disease infection (such as in hospital operating rooms), or the pollutants on masks are extremely dangerous, and there is concern about secondary pollution (such as radioactive particles) during storage, will it be stipulated that protective masks should not be reused.
If your mask does not fail (such as deformation, breakage, or excessive breathing resistance), you can reuse it, and you can judge whether the mask needs to be replaced or used according to the use situation.
I hope the above reply will satisfy you! If you have any questions, please feel free to ask the enterprise.