MAVALA SCIENTIFIC K+ Penetrating nail hardener. The new formula of Scientifique K+ with Dimethylurea improves the essential cohesion of the nail, sealing its three main layers. The aqueous solution penetrates soft, flaking or broken nails and strengthens them deeply. How to use Remove all traces of grease and manicure from your nails. Apply the product to the clean nail, from the center to the tip. Avoid touching the cuticles and the surrounding area which could also strengthen them. Leave it to penetrate for about a minute with your hands facing downwards. Use two or three times a week until desired results are achieved. Then, space out the applications. Ingredients Contains dimethylurea, a natural keratin hardener, and crystalline resin tears, produced by the pistachio mastic tree, an extract which in turn enables keratinization. Formaldehyde free. Format 5 ml bottle. (Cod.) M99503