When Do You Need to Change Your Mask？
If the N95 mask is not contaminated, not contaminated with droplets, and is not deformed, the mask and the face fit closely, and you can generally wear it for three days. However, if you are in contact with a
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Common Face Masks and Their Characteristics
Common masks are common masks (such as paper masks, activated carbon masks, cotton masks, sponge masks, gauze masks, etc.), medical masks, medical surgical masks, medical protective masks (such as N95 masks, KN95 masks, etc.). Ordinary masks can be washed repeatedly.