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Our nail care serum contains calcium chloride and sodium sulfide. It can help improve the problem of splitting nails make nails smoother and healthier and restore shine. Its use is simple: soak the affected nail in warm water to soften it. Use the included stainless steel nail file to gently scrape the affected nail to thin it. Take the appropriate amount of drops and evenly apply them to the affected nail then apply the contained corrective patch to the affected nail. And can be used continuously can moisturize the nail surface help reduce dryness and brittleness and make nails more elastic.