Terbinafine hydrochloride solution can be used to treat gray nails, and before the treatment, it is necessary to do fungal microscopy and culture test, take the fine scales of the gray nail groove area, as a companion test. In terms of treatment, the main treatment steps, the application of small files gently rubbing gray nail parts, gray nail to smooth or thin, apply terbinafine hydrochloride solution, twice a day, after the application of sterile gauze wrapped around the gray nail, so that the medicine can fully penetrate the nail plate and nail bed parts of the gray nail. At the same time, you can also take oral itraconazole capsules, or terbinafine hydrochloride tablets for treatment.