L'Oreal La Manicure Xtreme Hardener is a strengthening nail varnish specifically formulated for extremely weak and brittle nails. The formula is enriched with hardening resins and kerat-biotin, that immediately enhance and strengthen your nail structure. Within just a few weeks of use, you will notice harder and stronger nails, with fewer breakages and splits. You can wear the nail polish on its own, or use it as a protecting and strengthening base coat beneath your nail colour. L'Oreal La Manicure Xtreme Hardener contains 5 ml.