of their edge back, but not if the blades are so far gone they're no longer shredding. Worth a try, though, and something you can do every few weeks as upkeep to keep your shredder sharp. If you've got dull scissors too, go ahead and cut some more aluminum foil to keep them ...
You want to end up with a relatively thick strip of aluminum foil. The folded layers will sharpen the beveled edge of your dull scissors. Next, cut through the foil ten to twenty times (or more, if you want them sharper), always making sure the full length of the cutting edge is ...