"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Confession: I wash my hair almost every single day. I know, I know—it sounds like a cardinal sin for a ...

The debate over washing your hair—daily or stretching it out—is a beauty battle as old as shampoo itself. For years, women have been told to "train" their hair to be less oily by skipping washes, ...