Can you eat expired cheese slices?
Cheese. If you think about how cheese is made and aged, you might be more apt to believe it's the kind of food that doesn't always go bad after its expiration date. Even if there is a little mold growing, consuming "expired" cheese can be safe — as long as you cut off the mold and it still smells alright.
How long can you keep cheese slices in the fridge?
Both opened and unopened American cheese slices last 2-3 weeks beyond their best-before date in the fridge. To keep your cheese edible for longer, you will need to store it in the freezer.