1, metal bar distinction

The metal strip is above the mask, the side protruding outward is the outside, and the side not protruding inward is the inside of the mask.

2, crease distinction

The crease of the mask can distinguish the front and back. The crease is the inside of the mask and the crease is the outside of the mask. When wearing, make the mask fully spread on the face and completely fit, and try not to touch the outside of the mask when taking off the mask.

3, thread difference

One side with a thread head is the outside, and the side without a thread head is the opposite side.

Precautions for wearing a mask:

1, pay attention to hand hygiene.

Pay attention to keep your hands clean and hygienic. If you touch the mask directly under the condition of poor hand hygiene, hand pollutants will breed in the mask, thus affecting the use effect of the mask.

2. When wearing a mask, you should distinguish between the front and the back.

When using the mask, we should also pay attention to distinguish the front and back of the mask. If the mask is inside and outside, it won't play a defensive role.

3. Remove the mask to avoid contact with the outside.

In the process of removing the mask, try to avoid direct contact with the outside of the mask. Using the mask for a long time will lead to excessive pollutants attached to the outside of the mask.