"Tight shoes can compress your toes, forcing the flesh into the nail," says Jenny Salazar, a nail technician in New York City. Another culprit: Nails that are too short and curved in at the corners ...

Thick, yellow toenails left so long they split and crumble. Nails so misshapen they dig into the skin, causing infections. Or, in the most severe cases, curling into what we call ‘ram’s horns’ that ...

Toenails can reveal clues about your health and lifestyle. While brittle toenails often just happen along with aging, they could also hint at a vitamin deficiency or fungal infection. By zeroing in on ...