Penetrating nail hardener without formaldehyde. The tip of the nail is the most fragile, most unprotected part of the nail and breaks easily. This is therefore the part of the nail that needs to be strengthened. By quickly hardening the nail, MAVALA SCIENTIFIQUE K+ allows soft, flaking or splitting nails to become healthy and strong. Its formula improves the cohesion of keratin fibres, principal element composing the nail, strengthening the bond between the three layers of the nail. Instantly penetrates. Is neither a base nor a nail polish.