File your nails to the right length with the blue surface of the file. Roughen the nail surface with the pink part of the file. Polish with for 10 – 15 seconds with the white part. Then polish with the grey part to give the final finish. Make sure that the file only presses lightly against the nail. We recommend going through all three polishing steps at 4 – 5-week intervals, but you can use the grey surface as often as you like.