Mavala scientifique nail hardener a penetrating nail hardener which prevents nails from breaking or splitting one or two applications per week on the nail tip only experience has proved it the tip of the nail is the most fragile part and break easily this is therefore the part of the nail to be strengthened mavala scientifique launched in 1958 is the first penetrating nail hardener in the world its hardens nails immediately and bonds its three layers together it helps prev