Thinning Shears Cut Rates: What Every Tooth Count Actually Removes
Exact cut rate percentages by tooth count, blade types explained, and how to choose the right thinning shears for your technique and your client's hair.
The number on the box does not tell you enough
You pick up a pair of thinning shears (セニングシザー, seningu shizā) and the packaging says “30 teeth.” That number gives you a rough idea of how much hair the shears will remove per close, but it is only part of the story. Tooth shape, blade type, and tooth orientation all change the actual cut rate. Two 30-tooth thinners from different manufacturers can remove very different amounts of hair.
This guide breaks down cut rates by tooth count, explains the three main blade types, and covers how tooth orientation affects your results.
Cut rate by tooth count
Cut rate (カット率, katto ritsu) is the percentage of hair removed in a single close. Here are the standard ranges across the industry.
| Tooth Count | Approximate Cut Rate | Primary Use |
|---|---|---|
| 5 to 10 teeth | 50 to 70% | Heavy texturizing, chunking |
| 14 to 15 teeth | 30 to 40% | Bold texture, dramatic volume removal |
| 20 to 25 teeth | 25 to 35% | Medium thinning, everyday blending |
| 30 to 35 teeth | 15 to 25% | Standard thinning, subtle blending |
| 38 to 46 teeth | 5 to 15% | Fine thinning, invisible blending |
These are approximations. The actual rate depends on tooth width, gap spacing, blade geometry, and how the shears are angled during the cut.
Low tooth counts (5 to 15) remove large sections of hair in each bite. The result is visible texture with clear separation between cut and uncut strands. Think of these as sculpting tools. They are useful for creating movement in thick, heavy hair or for deliberate chunky effects.
Mid-range counts (20 to 35) are the workhorses. A 30-tooth thinner handles most everyday thinning tasks. It removes enough bulk to make a difference without leaving obvious lines or marks in the hair. Most stylists keep at least one pair in this range.
High tooth counts (38 to 46) are finishing tools. They remove so little hair per close that the effect is almost invisible. Use these for final blending passes, softening hard lines, and cleaning up weight without the client noticing you have switched tools.
The three blade types
The teeth on your thinning shears are not all the same shape. Three main designs exist, and each cuts differently.
V-groove (V-tooth)
The most common design. Each tooth has a V-shaped notch cut into it. Hair slides into the V and gets trapped between the closing blades. V-groove teeth grip hair firmly, which means less slipping during the cut. The downside is that the grip can leave more visible demarcation lines in certain hair types, especially fine or straight hair.
V-groove thinners work well for thick, coarse, or curly hair where you need the teeth to hold the hair in place.
Flat comb
Flat comb blades have smooth, flat teeth without the V-notch. Hair can slide along the tooth surface more freely. This produces a softer blend because the cut strands are less uniformly placed. Flat comb thinners tend to create less visible lines in the finished style.
They are a good choice for fine to medium hair, or for any situation where you want the thinning to be undetectable.
Step comb
Step comb teeth are cut at alternating heights. Some teeth are taller than others, which means each close captures hair at multiple points along the strand. This creates a more graduated removal pattern.
Step comb designs are less common than V-groove or flat, but they are favored by some stylists for creating natural looking texture without harsh weight lines.
Tooth orientation: one comb vs. double comb
Most thinning shears have one smooth blade and one toothed blade. This is the standard “one comb” configuration. The smooth blade does the cutting while the toothed blade determines which hairs get cut and which escape.
Double comb thinning shears have teeth on both blades. When both blades have teeth, the cut rate drops significantly because hair has two chances to escape (through either blade’s gaps). A double comb thinner with 30 teeth per blade might remove only 5 to 15% of hair per close, similar to a single comb thinner with 40+ teeth.
Double comb shears are useful for extremely subtle blending. They are forgiving tools because it is nearly impossible to over-thin with them.
Teeth up vs. teeth down
How you hold your thinning shears changes the result.
The Japanese method (日本式) positions the toothed blade facing downward. This approach avoids visible marks on the top layer of hair because the cut happens underneath.
The European method (欧州式) positions the teeth facing upward. This is the traditional Western thinning technique.
Some manufacturers build thinning shears with 360-degree pivot faces, allowing you to flip the orientation without affecting blade alignment. This lets you switch between both methods with the same pair.
Choosing the right thinner for the job
Match tooth count to hair type
Thick, coarse hair benefits from lower tooth counts (14 to 25 teeth). These clients need significant volume removal, and higher cut rates get the job done faster with fewer passes.
Medium hair works well with mid-range counts (25 to 35 teeth). You have enough removal per close to be efficient without risking over-thinning.
Fine hair demands high tooth counts (35 to 46 teeth). Fine hair shows every mistake. A thinner that removes too much per close will leave visible holes and thin spots that are hard to fix.
Match blade type to technique
If you primarily do blunt work and need thinning shears for removing bulk, V-groove teeth give you the control you need. The grip keeps hair locked in place for predictable results.
If you do a lot of finishing and detail work, flat comb blades produce softer transitions. They are better for refining a cut than for heavy bulk removal.
Build a thinning kit
Owning one pair of thinning shears is not ideal for most working stylists. A practical setup includes at least two.
First pair: mid-range workhorse. A 28 to 35 tooth thinner with V-groove or flat comb teeth handles the majority of everyday thinning tasks. This is the pair you reach for most often.
Second pair: finishing tool. A 40+ tooth thinner (or a double comb) for final blending, softening graduation lines, and cleaning up around the perimeter. This pair keeps results looking polished and natural.
If you regularly work with both very thick and very fine hair, consider adding a low tooth count pair (10 to 20 teeth) for heavy texturizing. Three pairs covers nearly every scenario.
Common mistakes
Over-thinning in one area. Move the shears through the section rather than closing multiple times in the same spot. Repeated cuts in one place create holes.
Thinning too close to the root. Stay at least two to three inches from the scalp. Thinning near the root creates short spiky hairs that stick up as the hair grows.
Using the wrong cut rate for the hair type. A 15-tooth thinner on fine hair will remove too much too fast. Start with a higher tooth count and make addtional passes if needed.
Ignoring blade type. A V-groove thinner on fine, straight hair can leave visible track marks. Match the blade design to the hair, not just the tooth count.