Does the mask have a shelf life?

Does the mask have a shelf life?
Have. The mask is valid for two years.

When purchasing a mask, in addition to carefully checking whether the surface of the mask is clean and even, whether there is damage and stains, and whether the size is appropriate, you should also check the product specifications, manufacturers, standard numbers implemented, product approval number, etc. It is the production date and expiration date, the general mask is valid for two years.

Because the mask directly contacts the face and mouth, its breathability, skin flexibility, stretchability, and durability are the main factors that determine the length of use of the mask. Among them, breathability is directly related to the cleanliness of the mask, and only by ensuring the cleanliness of the mask, the mask can play its protective role, and will not become a breeding ground for germs.