1. The outer layer of the mask often accumulates a lot of dirt, bacteria and other dirt in the outside air, and the inner layer blocks exhaled bacteria and saliva. Therefore, the two sides cannot be used interchangeably, otherwise the dirt contaminated by the outer layer will When it is in close contact with the face, it is sucked into the human body and becomes a source of infection.

2. When the mask is not worn, it should be folded into a clean envelope, and the side that is close to the nose and mouth should be folded inward. Do not put it in your pocket or hang it around your neck. If the mask is wet with exhaled heat or saliva, its barrier effect will be greatly reduced.

3. It is best to prepare a few more masks in order to replace them, and they should be changed and washed once a day. When washing, first blanch with boiling water for 5 minutes, then gently scrub with hands, wash with water and expose to the sun. But there is activated carbon filtration and disposable does not need to be cleaned.