You often see commercials for gray nails on TV. In fact, gray nails are not always gray, but can also turn yellow, white, black, brown or even green. The scientific name for grey nails is onychomycosis. Nowadays, more and more people are concerned about the beauty of their toenails, wearing various colors of nail polish and even wearing various decorative fake toenails, but all of these cannot completely cover up a grey nail that has changed shape. In addition to changing the color of the nail, the nail will also be damaged by the fungus, making the nail thick and bad, like the wood arched by worms, and easily fall off the crumbs. If the owner of the grey nail is a compulsive, then the nail will also be keyed into various shapes, missing a piece, more than a piece, almost bald are there, bright shiny to show, really very solid. The treatment of gray nails, actually use oral medicine? Toenails are the most distal location of our body, but to treat these toenails, doctors will give you oral medication. Many people do not understand this. In fact, there are two reasons why oral medication is chosen. One is that topical medications are not effective. Toenails because of their structural peculiarities, it is difficult for all kinds of drugs used externally to penetrate in, so the treatment is naturally not effective. Unless topical drugs can be used when the surface of the toenail is first infected with fungus, oral drugs such as itraconazole and terbinafine hydrochloride tablets are needed in the vast majority of cases. Secondly, oral antifungal drugs have pro-keratin characteristics. That is, the distal toenail is more likely to be enriched with drugs because it is keratinous, so the treatment is effective. But like topical medications for foot fungus, oral medications are also to be adhered to and usually require treatment for 4 months or even longer.