Remove manicure and any oily film from nails. Apply MAVALA SCIENTIFIQUE K+ from the centre of the nail to the tip only. Avoid touching cuticles and skin around nails, in order not to harden them as well. Leave to penetrate for one minute, by holding hands downwards so that the product does not run onto the cuticles. Its application can be followed by your usual manicure (base coat, nail polish, top coat). Use two to three times a week until nails have obtained the desired hardness. Then, you may space out the applications.