It is recommended to use the patch mask immediately after opening, and the longest storage time should not exceed 2 hours. Because it will be in direct contact with the air after opening, the essence inside will slowly evaporate after a long time, thus weakening its skin care effect.

Moreover, the mask contains a lot of nutrients, which will breed bacteria if left for a long time. If this mask continues to be used, it will cause harm to the skin. ?

However, if it is a smear mask, it is recommended to use it within six months to one year after opening.

Whether the mask can be used for half a year mainly depends on whether the mask has expired. If the mask is unopened and still within the shelf life, it can be used again.

However, if the mask has expired, or the mask is in an unopened state, it can no longer be used, because the essence of this mask has failed, and it cannot achieve a good skin care effect, and there is still the possibility of bacteria breeding inside.