Can You Sharpen Serrated Knives?

Hint: Yes. Those little teeth just need a different kind of attention.

Serrated knives have a reputation for staying sharp forever.

They don’t.

They often stay useful longer than straight-edged knives, but eventually even a good bread knife starts crushing the loaf instead of slicing through it. The good news is that most serrated knives can be sharpened. They simply require a different approach.

Why Do Serrated Knives Stay Sharp Longer?

A serrated edge has pointed teeth with curved scallops between them. The points break through the food first, while the recessed portions of the edge do much of the slicing and receive less direct contact with the cutting board.

That is why serrated knives work so well on foods that are firm on the outside and soft inside, including:

• Crusty bread

• Tomatoes

• Citrus

• Cakes and pastries

  
  

That design protects part of the cutting edge, but not forever. Eventually, the points round over and the scallops become dull.

How Can You Tell When a Serrated Knife Is Dull?

Pay attention to how the knife cuts, not how long you have owned it.

Your serrated knife may need sharpening if it:

• Crushes or compresses bread

• Creates far more crumbs than it used to

• Tears tomato skin instead of cutting cleanly

• Slides across a crust before it begins to bite

• Requires more pressure or aggressive sawing

A sharp serrated knife should do the work for you. If slicing a loaf has become an upper-body workout, the knife is trying to tell you something.

How Is a Serrated Knife Sharpened?

A straight-edged knife can be sharpened along its full edge. With a serrated knife, each scallop acts like a small individual cutting edge.

A tapered ceramic or diamond rod, or a specially shaped diamond wheel, is matched to the size of the scallops. Each scallop is then sharpened individually while preserving its original shape and angle. Any small burr created on the flat side is carefully removed.

This is one of many reasons why pull-through sharpeners are a poor choice. They can grind across the teeth, change their shape, and slowly flatten the serrations.

Sharpening a serrated knife at home is possible with the correct tool and plenty of patience, but it is easy to alter the edge. Very fine micro-serrations and badly damaged teeth may require specialized equipment or may not be worth repairing. A professional sharpener can inspect the knife and help you determine what makes sense. How Often Should You Sharpen a Serrated Knife?

Serrated knives generally need sharpening less often than straight-edged knives. How often depends on what you cut, how frequently you use the knife, and how you care for it.

The simplest rule is the same one we recommend for every knife:

Don’t ask the calendar. Ask your knife.

If it still cuts cleanly with little pressure, keep using it. If it is crushing, tearing, or slipping, it is probably time. For help recognizing when your knives need attention, read our blog, How Often Should You Sharpen Your Kitchen Knives?

The Bottom Line

You do not need to throw away a good serrated knife just because it has lost its bite. In most cases, the edge can be restored while preserving the original serrations.

If your bread knife is making croutons before you finish slicing the loaf, Blade Butlers can help. Schedule your sharpening appointment, and we’ll bring the bite back.

Published: July 2026