Using white vinegar to cure gray nails is false. Gray nail, also known as nail fungus disease, is a fungal invasion of the nail plate or nail bed caused by nail lesions, and white vinegar as a kind of condiment, there is no therapeutic effect, only the acetic acid has a certain auxiliary effect on gray nails, and the concentration of acetic acid is only 5%, the concentration of the clinically used glacial acetic acid aqueous solution in 20%, it does not have the role of the treatment of gray fingernails. It is recommended that patients do not believe in the blind use of prescription, so as to avoid adverse consequences. Gray nail clinical mainly take systematic treatment, due to the external drugs can not well penetrate into the nail, the efficacy is limited, often take terbinafine hydrochloride tablets, itraconazole capsules and so on. The above drugs should be used under the guidance of a doctor, and it is recommended that patients with gray fingernails receive timely medical treatment, so as not to miss the opportunity for treatment.