Sheet Masks are probably the most convenient of all types of face masks out there. They are relatively cheaper too. But you might have noticed that when you open the packet, there will be some extra serum in the packet. And you might have wondered if you can use the same sheet twice to get the most out of your sheet masks. But reusing the same masks can do more harm than good. But that does not mean you have to throw away all that unused serum in the packet. Instead, before removing the face mask from its cover, squeeze out all the excess serum to the packet and save it for later. You can later use this serum on any dry sheet mask.