Soften the skin of the feet in lukewarm water for a few minutes and dry it carefully. Check that the blade is firmly fixed, then hold the tool firmly and pass it over the thickened area with light, short strokes in one direction only, tilting it slightly and without pressing, so as to remove only the hard skin in thin layers. Avoid reaching the living skin and stop as soon as the area is smooth. Rinse and dry the feet well. Replace the blade when it no longer cuts well or is damaged and, in a professional setting, for each new client. Dispose of used blades in a rigid, safe container. After each use, wash and disinfect the tool and dry it well. Do not use on broken, irritated or infected skin or on verrucas, and do not cut healthy skin. Keep out of the reach of children.