See a visible difference in your nails with Kerasal Fungal Nail Renewal Nighttime Nail Repair Patches. Kerasal Nighttime Fungal Nail Renewal Patches help improve the appearance of nails that are damaged by fungus. These fungal nail patches work while you sleep, up to 8 continuous hours, deeply penetrating the nail to reduce discoloration and thickness, revitalize brittle nails and improve overall appearance. It helps to reduce discoloration and thickness, and hydrate and exfoliate brittle nails to soften and loosen the damaged layer. Cover each nail with these nail stickers for 6-8 hours.