Science Reveals the Secret to Making Your Razor Last

Time and tide wear away all things, even when the thing is a metal razor and the tide is in your bathroom sink. Every razor grows dull. It'll happen any way you cut it, whether every day or the U.S. average of 4.3 shaves a week. At $3 or more for a stainless steel cartridge, the question is how to forestall that moment.

"Keeping a blade dry matters," says Robert Ambrosi, the owner of Ambrosi Cutlery, a business that sharpens the knives of many of New York City's commercial kitchens. "And razor blades are thin, which makes them even more susceptible to corrosion."