5 Knife Care Mistakes That Ruin Your Blades

Mistake 1: Putting Knives in the Dishwasher

This is the single most damaging thing you can do to a kitchen knife. The dishwasher destroys knives in three ways: the high-pressure water jets knock blades against other utensils and the rack, causing micro-chips along the edge. The harsh detergent is abrasive and can corrode both the blade and handle. And the heat cycling — hot wash followed by cool dry — can warp thinner blades over time.

Even "dishwasher-safe" knives suffer. That label means the handle material can survive the dishwasher, not that the edge will remain sharp. Hand wash your knives with warm soapy water immediately after use, dry them with a towel, and put them away. This takes 30 seconds and extends the life of your edge by months.

The exception: cheap serrated bread knives that you plan to replace rather than sharpen. These are the only knives where dishwasher convenience outweighs the damage.

Mistake 2: Using Glass or Ceramic Cutting Boards

Glass and ceramic cutting boards are knife killers. They're far harder than steel, so every time your blade contacts the surface, the edge folds, chips, or dulls. You might as well chop on a concrete slab. You can literally hear the damage happening — that harsh, grating sound of metal on glass is the sound of your edge being destroyed.

Use wood or plastic cutting boards instead. Wood is the gold standard — it's firm enough to cut on but soft enough that the blade edge sinks slightly into the surface rather than impacting it. End-grain cutting boards are especially gentle on knives because the wood fibers absorb the blade rather than resisting it. Plastic boards are a close second and easier to sanitize.

Marble, granite, and stone countertops are equally damaging. Never cut directly on your countertop, no matter how convenient it seems. Always use a board.

Mistake 3: Storing Knives Loose in a Drawer

Tossing knives into a utensil drawer is terrible for the blades and dangerous for your fingers. Every time you open the drawer, the knives slide and bang against each other, other utensils, and the drawer itself. This causes the same kind of micro-chipping that happens in a dishwasher — gradual, invisible damage that accumulates until the knife feels noticeably dull.

Better storage options include a magnetic knife strip (wall-mounted, saves counter space, and keeps edges completely separated), a knife block (the classic solution — just make sure to insert blades spine-first so the edge doesn't drag against the wood), or blade guards (plastic sheaths that slip over individual knives, making drawer storage safe).

A good knife set usually comes with a block or storage solution. If yours didn't, a magnetic strip is the most space-efficient upgrade you can make for under $20.

Mistake 4: Never Honing (or Confusing Honing With Sharpening)

Most people think that steel rod that came with their knife set is a sharpener. It's not — it's a honing steel, and it serves a completely different purpose. A knife's edge doesn't just get dull from material loss; it also bends and folds at a microscopic level during normal use. Honing straightens that folded edge back into alignment. Sharpening removes metal to create a new edge.

You should hone your knife every 2-3 uses — before or after each cooking session is a good habit. Hold the steel vertically with the tip resting on a towel on the counter. Draw the blade down and across at a 15-20 degree angle, alternating sides, 5-6 strokes per side. This takes 15 seconds and keeps your edge aligned between sharpenings.

Actual sharpening (removing metal to create a new edge) only needs to happen every 3-6 months for home cooks, depending on how often you cook. For a detailed walkthrough, see our guide on how to sharpen kitchen knives at home.

Mistake 5: Using the Wrong Knife for the Job

Using your chef's knife to pry open a can, cut through frozen food, or scrape food off a cutting board (blade-side down) damages the edge in ways that regular honing can't fix. These actions cause large chips, bent tips, and stress fractures in the blade.

Prying and twisting: Kitchen knives are designed for slicing and chopping — downward force through food. They're not pry bars. Lateral force (twisting, prying) can chip the edge or even snap the blade tip. Use a can opener, bottle opener, or the right tool for the job.

Cutting frozen food: Frozen food is essentially ice, and ice is harder than most kitchen knife steels. Forcing a blade through frozen food will chip or roll the edge. Let food thaw first, or use a heavy cleaver specifically designed for that kind of impact.

Scraping the board: After dicing onions, the natural instinct is to flip the knife over and use the blade edge to scoop food off the board. This drags the edge sideways across the board surface, dulling it quickly. Instead, flip the knife and use the spine (the top, dull edge) to scoop. It works just as well and doesn't touch the sharp edge.

The Bottom Line

Knife care isn't complicated — it just requires breaking a few bad habits. Hand wash instead of dishwasher. Use wood or plastic boards. Store knives properly. Hone regularly. Use the right tool for the job. These five changes will keep your knives sharper, longer, and save you money on replacements and professional sharpening. A sharp knife is safer, more efficient, and makes cooking genuinely more enjoyable. For a broader look at getting the most from your kitchen, our air fryer tips guide is another great resource for leveling up your cooking skills.