1. Wash your hands before wearing a mask, or avoid touching your hands with the inside of the mask while wearing the mask to reduce the possibility of the mask being contaminated.
2. Distinguish the inside, outside, top and bottom of the mask clearly.
3. Do not squeeze the mask by hand, KN95 mask can only isolate the virus on the surface of the mask. If you squeeze the mask by hand, the virus will wet the mask with the droplets, which is easy to cause virus infection.
4. Try to make the mask ...