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What's the best way to treat dry hair?

—Lauren Angueira, Miami

Bobbi: I've been styling my hair with a hair oil from Moroccanoil (moroccanoil.com for salons) ever since my hairstylist introduced it to me last year. It's made of argan oil, a rich emollient that adds moisture to your hair, and hydrating vitamins A and E. Simply apply it after you shower and before you blow-dry (the oil doubles as a heat protectant). I know I sound like a hair commercial, but it leaves my hair glossy and silky to the touch.

Next: How can I freshen my hair at the gym without washing it?