Masks can't be used when they are expired. After the mask expires, the ingredients inside will deteriorate and the facial skin will be very fragile. Expired masks are easy to hurt the skin and cause various problems.

The shelf life of masks is generally 3 years, and once the masks are sealed, the shelf life is only a few months to a year.

Don't use this on your face, because it's not good if you are allergic. But it can be used in other parts of the body, so you can try it if your skin is not very sensitive.

However, there are other tricks, such as expired masks can be used to wipe joints, and it is also possible to apply masks at ordinary times. While watching TV, rubbing calluses on joints with discarded masks can help metabolize aging cutin and soften calluses.

It can also be used to polish leather goods, use it to polish furniture, restore luster and repair tiny cracks. The effect is also very good.

Generally speaking, however, masks should not be stored too much at a time. It's a waste to accidentally store it after it's expired!