If your toenails or fingernails have become brittle, changed shape, thickened, or are crumbling at the edges, a fungal infection might be to blame. Over-the-counter antifungal treatments may help. Preventive steps include keeping nails short, dry, and clean and avoiding going barefoot in public places, such as gym showers. For other fungal infections, see jock itch/antifungal products and athlete's foot/antifungal products.
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