# Why Your Knives Keep Going Dull: The Hidden Culprit in Your Kitchen Discover how cutting boards secretly damage your knife edges. - **Source:** [Trendir](https://brifing.si/source/fa0937ee-5bfe-4107-bbbb-30be072b2212) - **Published:** 2026-08-21 - **Original article:** - **On Brifing:** https://brifing.si/s/3a13ecee-fe91-4281-bdad-e7f2bcd33642 ## The hidden enemy of knives A new knife cuts perfectly at first but can dull quickly. According to America's Test Kitchen's robotic tests, some cutting boards can noticeably dull a blade in just 50-100 cuts. MIT microscope examinations reveal that hard surfaces cause microscopic fractures and folds on the knife edge. This damage is invisible but rapidly reduces cutting performance. ## Impact of hard surfaces Glass, marble or granite cutting boards are the worst options for knives. On the Rockwell hardness scale, standard knives rate 54-58 while Japanese knives reach 60-62, but these materials are much harder. With each cut, the blade edge - thinner than human hair - impacts these hard surfaces and deforms. America's Test Kitchen strongly advises against such boards. ## Common misconception Many consumers view expensive, stylish glass or stone cutting boards as premium options. Yet these materials create destructive effects on knives. The 'good-looking' boards brought out for guests actually damage all kitchen knives. UK's Deer Oak tests show knives using wrong boards dull within weeks. ## Safety risks of dull knives Dull knives are more dangerous than sharp ones because they require more pressure to cut, increasing the risk of the blade slipping and cutting you. America's Test Kitchen's robotic tests making 5,000 cuts daily proved proper board use can preserve knife sharpness for months. Board choice is critical for cutting safety. ## Best cutting board alternatives Experts recommend three main alternatives: 1) Thick hardwood boards (maple, walnut or teak, $25-60). Jones Cutting Boards' maple model offers 'lifetime' use. 2) Bamboo boards (~$15), slightly harder than wood but much softer than glass. 3) HDPE plastic boards, the durable and knife-friendly choice preferred by restaurants. ## Cost-effective solution Extending knife life doesn't require big investments. Proper boards costing $15-60 can keep knives sharp for months. Long-term, this prevents frequent sharpening costs and premature knife replacements. America's Test Kitchen notes the investment pays for itself in 1-2 years. ## Industry insight Over 85% of professional kitchens use HDPE plastic or wood boards. Restaurants prefer these materials to optimize knife lifespan and staff safety. According to hotel/restaurant supplier WebstaurantStore, glass boards are almost never used in commercial kitchens due to unacceptable knife damage and noise levels. ## Permanent solution Breaking the knife dulling cycle is as simple as changing your board. Proper material selection keeps knives sharp for months. This change enhances kitchen safety while saving time and money. Experts note 92% of users who switch to proper boards never return to old habits. ## Sources covering this story - https://www.trendir.com/your-knives-keep-going-dull-no-matter-how-often-you-sharpen-them-its-one-thing-almost-every-kitchen-gets-wrong/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._