This is a topical product, so apply it on the affected toenails or skin for external use only. One can apply this twice in the morning and twice in the afternoon. Use the enclosed brush applicator, this can coat the nail. A cotton swab should be able to work the solution into the nail cuticle.  Use an emery board to smoothen the nails. This files the surface of the affected nail and allows the liquid to absorb more thoroughly.