Gray nails are a fungal infection and usually do not get better on their own if left untreated. Gray nails are caused by a fungus that passes through the skin and infects the nail bed, causing the nails to turn grayish-white. The infection of gray nails is usually related to the exposure of oneself to the fungus. On the one hand, one’s own immunity is lowered, and the autoimmune barrier against fungal infection is missing. Because gray nails belong to the fungal nail infection, severe cases of external antifungal drugs are generally ineffective, so it is recommended to take oral antifungal drugs for treatment. Commonly used oral antifungal drugs are itraconazole capsules, terbinafine tablets and so on. After regular treatment with antifungal drugs, gray nails can be effectively recovered. It is recommended to consult a doctor in a timely manner, and the medication should be used in accordance with the doctor’s instructions.