Mavala Scientifique K+ Hardens The Nail Plate Thanks To A Scientific Active Ingredient That Improves The Cohesion Of Keratin Fibres Thus Allowing The Three Principal Nail Layers To Bond Together. It Also Contains Crystal Resin Tears, A Gum Extracted From The Pistachio Mastic Tree That Helps The Natural Keratinization Process Of Nails, Reinforcing Them. This Penetrating Aqueous Solution, That Is Neither A Base Nor A Nail Polish, Hardens Soft Nails And Avoids Them Breaking Or Splitting.