Only product with visible results in just 2 days. starts working in 2 days (Based on Kerasal published data and product label claim data). Opti-Nail. Kersal. Starts improving nail appearance in just 2 days. Triple Action Formula: Lightens, smooths, moisturizes. Clinically proven. Proven formula that results in healthier-looking nails. Clinically proven triple action formula that lightens, smooths, and moisturizes. Mess-free pen applicator with precision tip. Opti-Nail: Starts improving nail appearance in just 2 days (Based on Kerasal published data and product label claim). Precision tip pen applicator. Dries faster than the leading brand (Based on cosmetologist evaluation of drying time compared to leading brand). Contains a special nail brightener. Opti-Nail does not treat, cure or prevent fungal infections. Proven effective. Precision, no mess pen applicator. 3-month supply for up to 3 nails. Results in clear, healthier-looking nails.