Washing your hair can sometimes seem like nothing more than a time-sucking chore. "Shampooing removes sebum or oil that normally coats the hair shaft," Dr. Brendan Camp, a dermatologist at New York’s ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." If you don’t wash your hair often enough, oil and product buildup can lead to scalp issues like dandruff, ...