Here's another tip for sharpening disposable razor blades using a pair of jeans: http://www.youtube.com/watch?v=B3Kxiom83Js http://www.youtube.com/watch?v=B3Kx

Here's another tip for sharpening disposable razor blades using a pair of jeans: http://www.youtube.com/watch?v=B3Kxiom83Js http://www.youtube.com/watch?v=B3Kxiom83Js Basically, you're using the denim as a strop to rub off the debris which accumulates on the blade (which appears to be responsible for most of the dulling effect). The blades themselves remain sharp for ages. I've been doing this for a while and now use each regular Mach 3 blade for 3-4 months of daily use.