 But you don't notice it and you can't swap this filter to pull it off your face Now both sides are sealed 24 hours and basically what makes them expire eventually is because they're to come out But no air to go in. I know a lot of people like to take this out It's not to be floppy around with your left hand left and right hand off that mop I recommend not taking off your mask off Or the entirety of you taking mop off because as soon as you go and take the mop off you get all this stuff Like to attack your megas membrane There's a lot of other sebum agents So just don't flip your face. It's going to reactivate