Duration of use may vary depending on the appearance of the nail. In many cases, up to six months of use may be required for satisfactory results. A normal-looking nail generally takes up to twelve months to grow out For best results, avoid using nail polish while using Cruex Fungal Nail Revitalizing Gel Cruex Nail does not cure or prevent fungal infections Cruex Nail is specially formulated to help reduce the thickness, discoloration and odor of affected nails.