Does Dishwasher Dull Knives?

Does the Dishwasher Dull Knives? Jody's Bakery
Does the Dishwasher Dull Knives? Jody's Bakery from


Knives are essential tools in every kitchen, used for various cutting and chopping tasks. Keeping them sharp is crucial for efficient and safe cooking. However, many people wonder if using a dishwasher to clean their knives can dull the blades over time. In this article, we will explore whether dishwashers can indeed dull knives and provide tips on how to maintain their sharpness.

The Dishwasher’s Effect on Knives

It is true that dishwashers can potentially dull knives due to the high heat, strong detergents, and abrasive movements. The high heat can cause the metal of the blade to expand and contract repeatedly, leading to micro-abrasions and loss of sharpness. Additionally, the strong detergents used in dishwashers can be harsh on the blade surface, further contributing to dullness.

Factors That Influence Dulling

While dishwashers can dull knives, the extent of dullness depends on several factors:

1. Knife Quality: High-quality knives made from harder materials like stainless steel or carbon steel are generally more resistant to dulling than lower-quality knives.

2. Dishwasher Settings: The temperature and intensity of the dishwasher cycle can affect the dulling process. Higher temperatures and longer cycles are more likely to dull the blades.

3. Knife Placement: Knives should be placed in the dishwasher in a way that minimizes contact with other utensils or the dishwasher walls to prevent excessive movement and potential damage.

How to Protect Your Knives

To maintain the sharpness of your knives and prevent them from dulling in the dishwasher, consider the following tips:

1. Hand Wash Whenever Possible

The best way to keep your knives sharp is to hand wash them using a mild dish soap and warm water. This gentle method avoids the harsh conditions of the dishwasher and minimizes the risk of dulling.

2. Dry Immediately

After washing your knives, make sure to dry them thoroughly with a soft towel. Moisture can lead to rust and corrosion, which can also contribute to dullness over time.

3. Use Knife Guards or Blocks

Invest in knife guards or blocks to protect the blade while storing your knives. These accessories provide a safe and secure environment, preventing any accidental damage or dulling.

4. Sharpen Regularly

Regardless of how you clean your knives, regular sharpening is essential to maintain their sharpness. Invest in a high-quality knife sharpener or consider professional sharpening services to ensure optimal performance.


While dishwashers can potentially dull knives, taking proper care and following the tips mentioned can help you maintain their sharpness. Hand washing, drying immediately, using knife guards, and regular sharpening are all important steps in preserving the longevity and performance of your knives. By implementing these practices, you can continue enjoying efficient and safe cooking with sharp, reliable knives in your kitchen.