Patient: My left thumb got infected when I cut my nails 5 years ago, and I learned later that it was gray nail. At first, I used “bright nail”, but it didn’t work. I hope Dr. Jia Li can help me. I wonder if my gray nails can still be eradicated? What treatment should I take? How long will it take? What is the cost? Hospital Dermatology: Nail fungal disease, commonly known as gray nails, can be cured in the vast majority of cases. From the photos, internal medication is required, currently mostly itraconazole or terbinafine, with topical medication working better. The standard course of treatment for nails is 3 months and for toenails is 4 months. The cost is over $1000. The specific medication needs to be chosen by a specialist.