Not necessarily, at least not in the way you might think. Quite often, after a little use the blade’s edge will curl. It will still cut, but it isn’t quite as sharp as it was when you started. All that’s needed at this point is to run it on a strop a few times to straighten that microscopic edge. It is only if that isn’t enough that you’ll want to turn to truly sharpening the knife. Keep in mind that any sharpener works by removing steel from the knife. Thus, the more often you run it across a sharpener, the more steel you’ll lose over time. Strop it first and maintain that edge as best you can before turning to one of these products.