So how long is the shelf life of a mask? As with the shelf life of some other skin care products, the shelf life of the mask is also relatively long. In general, the shelf life of the mask is about three years, but this is mainly for masks that are not open. For those who have already opened the mask, the shelf life is generally only a few months to a year or so.

　　So how do we save the mask if it is placed normally?

　　1, the refrigerator

　　When storing the mask at ordinary times, it is recommended that you place it in the refrigerator cabinet of the refrigerator. Because in the hot weather, putting the mask in the refrigerator can increase its pore-shrinking and calming effect. Therefore, when you save the mask, you are advised to put it in the refrigerator. Refrigeration has a good preservation effect on cosmetics, so you don't have to worry about cosmetics expiring quickly.

　　2, fresh bags

　　Although keeping the mask in the refrigerator can prevent the loss of its ingredients, it does not guarantee that the mask will not deteriorate. Because the mask is easily combined with other ingredients, it can cause emulsification and even cause the mask to deteriorate. Therefore, when you usually save the mask, especially the canned mask, it is recommended that you first seal it with a fresh-keeping bag and then put it in the refrigerator for storage.