Toenail fungus affects millions of Americans, turning nails yellow, thick, and brittle. It's more than a cosmetic concern—left untreated, fungal infections can cause discomfort, spread to other nails, ...

Toenail fungus is one of those conditions people whisper about—as if it’s a personal failure instead of an incredibly common, treatable issue. It shows up slowly: a yellow tint, thickening, a change ...