Consumer Reports: Knife-sharpening know-how Tags: Knife Sharpener You use them every day, but chances are they don’t get the TLC they need: We’re talking about kitchen knives. If yours haven’t been sharpened in the past few months, you’re probably cutting—or trying to cut—with a dull knife. That’s not only frustrating but also dangerous. Consumer Reports reveals the tools you need to keep your knives slicing and dicing for years to come. Pull-through sharpeners typically cost $5 to $50. With these, you start right at the base of the knife near its bolster and pull all the way through to the tip. Once you’ve made a few passes on the coarse setting, you want to progress to the finer settings to polish the edge.