I happen to chance upon this body shop foot file introduced by a podiatrist (foot doctor) which cost S$6.90. I don't have any troubled feet problem but thought I should just give it a try just for fun. -.-" Before (no idea why it looks dirty despite washing them thoroughly): With a *wave of my foot file* and a shout out "dead skin be gone!" TADAH! Results : Honestly, I have no idea how to use it. After washing & drying them, I just happily file my feet by scrubbing it against those areas with thicker skin. It feels like sandpaper and the file will have visible dead skin (those powder looking thing) attached to it. Then I ended the process by washing and drying them again and applied moisturizer (I feel it absorbs better after filing). My foot became smoother, fairer and free from callus~ :) I did some research and realise that I should also soak my feet before filing. Maybe I can also do a foot mask after filing.