Home / Sharpening Signs

When to Sharpen Hairdressing Scissors (and When Not To)

Sharpen too rarely and you fight a dull tool; sharpen carelessly and you destroy a good one. Here’s how to read the signs and do it right.

The signs your scissors need sharpening

• Folding or pushing. Hair bends out of the blades instead of being cut cleanly — the clearest sign.
• Snagging at the points. The tips grab or won’t cut the last few hairs cleanly.
• A “crunch” instead of a clean slice. You can hear and feel the difference.
• Pulling on wet or fine hair. Dull edges drag rather than slice.
• Needing more pressure. You’re squeezing harder to get a clean cut — hard on the scissor and your hand.
• Failing the tissue test despite correct tension (see our maintenance routine).

First, rule out tension

Before you book a sharpen, check the tension. A surprising share of “blunt” scissors are simply too loose — the blades separate mid-cut and fold hair. Adjust the tension and re-test. If it still fails, then it’s a sharpening matter.

How often should you sharpen?

• Full-time stylist: every 6–12 months depending on steel grade.
• Part-time: every 12–18 months.
• Harder steels (Hitachi ATS-314 at 60–62 HRC) hold an edge longer — often a year-plus.
• Softer steels need it more often — and if they need it constantly, the steel itself is the problem.

Never let a machine near a convex edge

This is the most important rule on this page. A professional hairdressing scissor has a convex edge — curved across its width. It must be restored by hand on Japanese water stones. A rotary sharpening machine, a knife sharpener, or a DIY rod will flatten the convex curve into a bevel and permanently ruin the geometry. The scissor will cut for a week, then push hair forever after. Many scissors arrive at a scissorsmith’s bench already destroyed by a single pass on the wrong machine.

When NOT to sharpen

If a scissor is soft generic stainless that loses its set within weeks, repeated sharpening is throwing money away — the edge can be restored but the steel won’t hold it. At that point the honest answer is to replace it with a properly forged scissor in named steel, not to keep paying to sharpen something that can’t hold an edge.

Who should sharpen your scissors

Use a qualified scissorsmith who works on water stones, polishes the inside ride line, and re-sets the tension — not a general knife/tool sharpener. Many quality scissor makers include lifetime sharpening with purchase; ShearGenius, for example, hand-sharpens its scissors for life and also services other brands. Whoever you use, ask the four questions: water stones, ride line, tension reset, and a fold test before it’s returned. If they can’t answer, find someone who can.