White vinegar should not be used to treat gray nails. Ways to treat gray nails include topical medication, systemic medication and surgery. The concentration of acetic acid in white vinegar is too low to have a therapeutic effect. Scientific methods should be used to treat gray nails. Gray nails are fungal infections and need to be treated with antifungal medications. Topical drugs include amorolfine, cyclopyrrolidine, etc. Systemic drugs include terbinafine, fluconazole, itraconazole and so on. In addition, when gray nails are serious, surgical treatment can be carried out, including nail extraction, diseased nail removal surgery, and so on. You should go to the hospital when you have gray nails, and follow your doctor’s instructions when using the above medications.