Kitchen shears that do not cut often have a screw problem, not a blade problem: when the two blades do not press against each other firmly enough, the material slips into the gap instead of being cut, making the shears seem dull. That is why the maintenance sequence is clear: first the screw, then residue at the hinge, and sharpening last. Sharpen only the outer bevel; do not touch the flat inner faces.
Scissors do not cut like a knife; they cut by shearing. As the two blades slide past each other, they press the material between them, and that pressure creates the cut. That is why, for shears, pressure between the blades matters as much as sharpness. When the center screw loosens over time, that pressure is lost; the blades pass without touching, and even a thin parsley stem can bend and slip through. The user may mistake this for dullness and buy new shears. So when shears do not cut, the first thing to check is not the blade’s sharpness but how closely the blades meet.
The check is simple and requires no tools. Open the shears halfway and gently pull the two handles sideways apart; if you can see a gap between the blades, the screw is loose. On most kitchen shears, the screw is tightened with a flathead screwdriver; on some, it is a hand-turned nut. Find the right tightness by checking how they move: the shears should close slowly under their own weight, without sticking or falling freely. Overtightening the screw wears down the blades. After turning the screw, open and close the shears a few times without cutting anything and listen; a light, steady scraping sound as the blades pass each other indicates the correct adjustment.
The next step is cleaning the hinge. Residue collects around the screw on shears used to cut meat, poultry, and greasy dough; when it dries and hardens there, it pushes the blades apart and has the same effect as a loose screw. This is why kitchen shears that can be taken apart should be opened and washed. For shears that do not come apart, open the blades and clean the hinge with hot, soapy water and a brush, then dry them immediately and apply one drop of food-grade oil to the hinge. Apply oil only to the hinge, not the blades, and wipe off any excess right away; otherwise it can get onto the food being cut and leave an oily taste the next time you use the shears.
Sharpening comes last because most shears can be fixed before it is needed. The cutting edge is on the outward-facing bevel; the inner face is flat, and that flatness lets the two blades fit together precisely. Sharpen only along the outer bevel, preserving the blade’s angle and moving only outward. If a sharpening stone touches the flat inner face, the blades will no longer fit together; this is the one mistake that can ruin the shears for good.
Everyday care comes down to two habits. Do not put the shears in the dishwasher: dishwasher detergent removes oil from the hinge, prolonged wetness can cause rust around the screw, and wooden or coated handles can swell. Wash them by hand and dry them immediately after use, then store them closed. It also helps to keep separate shears for cutting bones and opening wire or plastic packaging; jobs outside the kitchen wear down kitchen shears fastest.