Like most blades, your box cutter will eventually get dull, and you'll want to make sure to sharpen it. A dull box cutter is not only difficult to use, but it's also far more dangerous than a ...

You can swap in a new box cutter blade if the edge is worn out, or you can sharpen your dull utility knife to give it more life. This is a sensible option if you don't have blades on hand.