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n95/kn95 mask is not a disposable mask. in this special case (resource shortage), it can be reused. but there are conditions: 1. when n95/kn95 receives contamination such as saliva, blood, tears and other body fluids, it must be replaced 2. the user obviously feels that the breathing resistance is greater than before and must be replaced 3. masks are damaged and must be replaced 4. it is recommended to replace it after using it 4 times.