Improves Nail Elasticity. To improve the appearance of nails, on hands & feet, that maybe brittle or discoloured. PRONAIL FORTE Nail Spray protects and supports nail repair. It is unique because it protects the nail from outside influences and can be used with brittle and discolored nails and on the surrounding skin. Can also be used in the shoes. Contains limonene acid which helps calm the skin.The spray is easy and hygienic to use.