17 Surprising Skin Savers

"It makes no sense applying anything to your face before bed if at night you're cozying up to bacteria," says Amy Wechsler, M.D., a New York City dermatologist and author of The Mind-Beauty Connection. Change linens at least once a week—and wash the dirty ones in hot water (130° F). Change them more often (particularly the pillowcases) if you've been sick.