do you use this on wet or dry feet ?

After a bath dry your feet then use.

I ordered an extra package of 20 Blades with the tool, and since you can use two sides of one blade (they are reversible), that should last a long time, for years even. I clean the blade after each use and keep them dry, so there is no rust. I do not remember how many blades come with the tool, but I would order 10 extra blades and you'll be set. The 20 pack was such a good deal, I went with them. Hope this was helpful.

Anyone have this problem? Blade is really sharp but doesn't seem to be designed right to actually shave my calluses. Doesnt seem to do anything. Thks

Its the best one I've had since an old school acrylic one that was gifted to me from the 1960's beauty school training days. Soak your feet for 15 mins or take a nice hot shower, dress quickly and start your feet. With an ankle comfortably over opposite knee with the credo shaver In an upright position, it will be at an Angle to your round heel. Start at the top of the angle you want to shave where the roundness begins on your foot, and gently shave downward. Be patient, gentle, and smooth glides. Try different areas don't remain in one spot. If you are concentrating on just a hard bumpy callus you may want to start with the big emery looking boards that are for the feet instead of a pumice stone, after a foot soak of course. Theres also Dr. Scholl' medicines for hard calluses. Also you can Consult a manicurist or doctor. They have creams to help process along better.