A knife sharpener can last anywhere from 5 to 25+ years, but its lifespan depends heavily on its material type and how often it is used. High-quality abrasive surfaces like diamond plates or ceramic stones can last a lifetime with proper maintenance, while handheld carbide pull-throughs wear out sooner.
The lifespan of a knife sharpener isn't just about «how many years until it stops working.» It's about how well it is engineered, what materials it's made from, and how you use, store, and transport it. With the right choice and proper care, a sharpening system can last for many years — even decades.
The Best Knife Sharpeners of 2026, Tested and Reviewed
Yes, you can use WD-40 as a lubricant on oil-based sharpening stones, but it is not the best option. Because WD-40 is very thin, it fails to effectively float away metal shavings (swarf), which can clog your stone.
Writing instruments such as crayons, chalk or soft/waxy (including colored) pencils will clog the sharpener's cutters. Check to see if these have been used. You can try cleaning the cutters and ring gear. Clean the cutter blades by wiping them with a dry cloth to remove the residue.
Pull-through sharpeners are not universally "bad," but they are generally discouraged for high-quality or expensive knives. They offer quick, convenient edge maintenance but are highly aggressive, removing excess metal and often leaving a fragile, jagged edge.
3-Finger Test
Lightly place the knife edge on your fingers (sideways, not pointing down) and gently pull. A sharp blade will feel very "grabby" and not slip easily over your skin.
Cutting boards made of glass, granite, ceramic, or your dinner plate may look stylish or convenient, but they are the fastest way to destroy a knife's edge. These surfaces are harder than your knife's steel. So every time your blade contacts them, it suffers microscopic edge deformation, chipping, or even rolling.
There is no functional or safety reason to keep WD-40 in a refrigerator. In fact, it is better stored at room temperature. However, you might hear about this because WD-40 is an excellent product for your fridge.
The best knife sharpener depends on your needs, but the Work Sharp Precision Adjust is the best overall choice for most people. It offers adjustable angles and guided sharpening, making it easy to achieve a razor-sharp edge. For a simpler, traditional method, a dual-grit whetstone is highly effective.
America's Test Kitchen (ATK) categorizes knife sharpeners by type, as electric and manual models excel at different jobs.
Ceramic rods can sharpen and the higher grits are great for polishing a finished edge. Diamond sharpeners are very aggressive and are best for quickly setting an edge or resetting the edge to a different angle. Diamond removes steel much faster than other sharpening materials.
For most kitchens, you only need three foundational knives to handle 95% of prep work: a Chef's Knife, a Paring Knife, and a Serrated (Bread) Knife. These three powerhouses can tackle anything from dicing onions and slicing crusty bread to peeling fruits and carving small meats.
Choosing the Best Grit for Sharpening Knives
For most home cooks, a 1000-grit stone is the best option to get started. Follow up with a 4000 or 6000 grit stone to polish the edge. An 8000 grit is very effective for those who want an exceptionally refined mirror finish.
The best pull-through knife sharpener overall is the Work Sharp EDC Pivot PLUS. It is highly regarded for its versatility, featuring carbide slots for quick repairs, ceramic rods for honing, and a built-in leather strop for a polished finish.
When cleaning a toilet bowl, WD-40 works by softening the rust and lime deposits, so they can be easily wiped away. You don't need to use much of it.
WD-40 Multi-Use is primarily a solvent designed to displace water, loosen rust, and clean. For long-lasting, heavy-duty, or specialized lubrication, upgrade to one of these targeted alternatives based on your needs:
To quickly fix a smelly fridge, place a small, open container of baking soda or used coffee grounds on a middle shelf. These act as powerful natural odor absorbers. For a pleasant scent, leave behind a bowl of lemon slices or a cotton ball soaked in vanilla extract.
Navy SEALs do not have a single standard-issue knife, but rather carry a mix of specific duty blades, hard-use survival tools, and custom-chosen personal knives.
In the high-end folding knife community, the original "Holy Trinity" refers to three legendary American makers who pioneered the modern premium tactical folder. Together, their designs set the gold standard for durability and precision.
A "Texas toothpick" can refer to two entirely different things: a classic, slender pocket knife or a popular Tex-Mex appetizer.
Rinse your knives under warm running water immediately after use. Also, use mild detergent because harsh chemicals can damage the blade's finish. Instead, try a mild dishwashing detergent and a soft sponge or cloth to clean the knife.
While white vinegar is an excellent natural cleaner, its acidity means it can damage certain surfaces, strip finishes, or cause rust. You should generally avoid using it on:
Yes, you can clean and sanitize a knife using hydrogen peroxide. It is an effective way to kill bacteria, but it should never be used as the first step for cleaning.