The Cutting Edge

The official blog of Knife Depot

Knife Myths: Dull Knives Are Safer Than Sharp Knives


It seems so obvious. A sharp knife, with its keen edges and stabby points, is much more dangerous than a dull knife. Right?


One of the biggest myths out there is that dull knives are safer than sharp knives. Even on some of the popular blade forums people can’t fathom the idea that a sharp knife is safer than a dull knife.

So we’re here to tackle the myth in all its glory.

Fact: Dull Knives Lead to More Mistakes

So how exactly is a dull knife more dangerous than a sharp one? To start with, the main reason why a dull knife is more dangerous is that it requires the wielder to use significantly more force when cutting than a sharp knife.

For example, if you’re cutting an apple and the blade is really dull, it will need more pressure to get through the apple. Once it’s through the apple, there’s a greater chance for the pressure to lead to slippage or a lack of control.

A sharper knife uses edge geometry to make a cut while a dull knife uses force. A sharp knife will often glide through materials without much effort. A dull knife, on the other hand, is clumsier and less user-friendly.

On top of that, using a dull knife can teach bad habits.

Proper knife technique is learned through repetition. However, things can go awry when you repeatedly practice knife etiquette with a dull knife. You may be using a knife the right way to cut some cardboard but then you need extra pressure with a dull knife. But when use a sharp knife, you apply that same amount of force and cut yourself.

Fact: Cuts From Sharp Knives Heal Faster

Yes, yes, but what about those times when you accidentally cut yourself with a sharp knife? The wound is usually much worse than a dull knife, you might argue.

The truth is that cuts from sharper knives can actually heal faster than those from dull knives. Here’s the logic from someone with no medical expertise: A dull knife leaves a wider and more jagged cut in the skin. The wider the cut, the more time it takes the skin and tissue to repair. On the other hand, even though a sharper knife may cut deeper, the cut is usually nice and thin.

I cut myself on a razor-sharp Swiss Army Knife blade the other day doing something absolutely stupid. The cut was deep and there was a lot of blood. But just a few days later, that cut was nearly 100 percent healed. I can’t say the same thing would have happened had the blade been dull.

Although accidents do happen, the safety of a knife really depends on the person using it and not the blade. But if you’re trying to minimize injury, remember that proper technique is important and a sharp knife is a safe knife.


  1. Timothy K. Toroian

    September 18, 2018 at 10:03 am

    The worst cut I had was from a dull knife. I was cutting cardboard, the knife hit a hard spot, popped out of the cut and right across my knee cap, deep enough I could see white.

  2. If a person is using an expensive knife, DO NOT cut cardboard as it can and usually does heat the blade very hot! This can damage the heat treating (tempering ) of the blade especially if done often. Now, Want is expensive? My answer would be, how much money do you have to throw away? In this knife makers thinking, I would purchase a folding utility knife that blades can be easily replaced. They were made for such. Can be found at hardware stores and places such as Home Depot.

  3. In my 74 years of experience, I have had far more serious injuries from sharp knives than dull knives. They cut quickly and deeply. I only use sharp knives now because they do cut more efficiently, and it is for that reason they are more dangerous in my opinion.

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