The Pritech Electric Callus Remover has three interchangeable heads ... "I have very large and stubborn calluses on both of my big toes," said one sandal-wearer. "This filed them down nice ...

Say goodbye to money spent on salon treatments, or nights spent scraping your heels with a manual callus remover - as this electric gem on Amazon promises near-instant results, with no mess.

Not to worry, though! Smooth soles and soft hands are within reach - you just need to know how to remove calluses. We chatted with a dermatologist and two top nail techs to demystify the science ...