1. Wash your hands before wearing a mask, or avoid touching the inside and side of the mask to reduce the possibility of contamination.
2. Distinguish the inside and outside of the mask, top and bottom; KN95 mask has a printed side for the outside; The metal strip/sponge strip ends at the top of the mask.
3. Do not use hands to squeeze masks, including N95 masks, which can only isolate the virus on the surface of the mask. If you squeeze the mask with hands, the virus will wet the mask with droplets, and there is still a chance of infection.
4. Make sure that the mask fits well with the face as far as possible. A simple test: After putting on the mask, exhale hard enough that air does not escape the edges of the mask.
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