What Is a Bread Knife Used For?

A bread knife is the long, serrated blade in the block — the one with the scalloped or toothed edge. It exists to solve one problem a straight-edged chef's knife cannot: cutting something with a hard, slippery outside and a soft inside without crushing it. And once you understand why it works, you realize it is good for far more than bread.

Why serrations work where a straight edge fails

A plain edge cuts by pressing straight down through food. On a crusty loaf that means the hard crust resists until you push hard enough — and then the blade crashes through and crushes the soft crumb. A serrated edge works completely differently: its teeth bite into and saw throughthe crust with a back-and-forth motion and almost no downward pressure, so the crust is severed cleanly and the crumb underneath keeps its shape. This is an edge-type problem, not a sharpness one — even a razor-sharp chef's knife squashes a fresh baguette, which is exactly the point we make in chef knife vs bread knife.

What else a bread knife is great for

Anything with a firm skin and a soft interior, and anything delicate that a straight edge would compress:

• Ripe tomatoes— the serrations bite the taut skin instead of skidding off it (a sharp chef's knife does this too, but a dull one really struggles).
• Cakes and layer cakes — sawing gently levels and slices without tearing or compressing the crumb.
• Melons, pineapple and citrus — the long blade and toothed edge handle thick rind and round shapes well.
• Soft cheeses and delicate pastries — a light sawing stroke cuts cleanly where pressing would smear.

Buying and maintaining one

A bread knife is the one place in the kitchen where you can save money. Serrations do most of the work regardless of steel quality, and — importantly — serrated edges are hard to sharpen at home (they need a tapered rod worked scallop by scallop, not a flat stone), so a serrated knife is more of a replace-when-dull item than a sharpen-forever one. Buy a decent inexpensive serrated knife, and put your knife budget into the chef's and paring knives you sharpen and keep. With those three — chef's, paring, serrated — you have the whole essential set, and the argument against buying a big block.