Does putting knives in the dishwasher make them dull?

Putting knives in the dishwasher can indeed make them dull. Dishwashers use high-pressure water jets and harsh detergents that can wear down the sharp edges of knives. The constant exposure to water and the abrasive action of the detergent can cause the blades to become blunt over time. Additionally, the high temperatures inside the dishwasher can damage the tempering of the steel, making the blades more susceptible to bending or breaking.

If you want to keep your knives sharp and in good condition, it is best to hand-wash them with warm, soapy water and dry them immediately. You can also use a honing steel or a sharpening stone to maintain the sharpness of the blades.