For chapped lips, you may be all about lip balms, but it's important to think of all aspects of hydration. Lips lose moisture while you sleep, especially if you're a mouth-breather or live in an overly heated home. Use a cool-mist humidifier at night (and during the day if possible) to keep lips moisturized. (It'll help with dry skin and coughs, too.)

Speaking of which, if you're a mouth-breather, consciously practices breathing through your nose. Like licking your lips, breathing through your mouth can dry them out.

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As far as trends go, matte liquid lipsticks are currently reigning supreme. The only drawback? They can be drying as all hell. If your lips are dry and flaking, you may want to put mattes on hiatus. But if you're just trying to keep chapped lips at bay, head them off with this simple remedy: Layer on lip balm or petroleum jelly before applying your favorite matte shades to prevent chapped lips says Prystowsky. Smith's Rosebud Salve $6, happens to work great in this situation.

A day at the beach or on the slopes can cause burned, chapped lips. To prevent them, wear a lip balm with SPF 30 and reapply every 30 minutes. Try Supergoop! AcaiFusion Lip Balm Broad Spectrum SPF 30, $9.50, or Sebamed Lip Defense Stick SPF 30, $4.99. If your lips are already chapped, however, SPF could irritate them further.

"When it comes to lip care I think that less is more," explains Dr. Prystowsky. "The more products you introduce to your lips, the more likely you are to develop a negative reaction. And often it's just not worth it." In other words: Find the products that work for you, and stick with them.

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