Ensure that your nails are smooth and even with Dr LeWinns Renunail Ridge Filler (14ml). Formulated with strengthening pearl powder, nourishing avocado oil, hydrating vitamin E and fortifying calcium, this easy-to-use treatment fills out ridges on the nail bed, allowing your nail polish to go on evenly for a longer lasting finish. - L.M. Directions of Use: Apply one coat and let it dry for one minute Use alone or under nail polish