4 easy steps to nail perfection item details simple and easy to use follow the 4 steps to remove any ridges and buff your nails to a smooth high gloss shine step 1 file your nails to the desired lengthnalways file from the outside edge to the centre of the nail step 2 once a month use the black side to remove ridges from the nail surface step 3 once a week use the white side to gently buff and smooth the surface of the nail step 4 once a week use the grey side to produce a high gloss fi