I use to use my Mach 3 on both my head and face, but I now use the HeadBlade on the noggin. I would use a new blade on the Noggin until it was no good for the head. I would then use that blade for the face, and yes it would still shave the face very nicely for about a week. I will admit that I would use the same new blade on both the face and head every so often..........had to indulge myself RIGHT?