The contrast of the cold, wet weather outside and the harsh, dry heat inside during the winter months can take a serious toll on your lips. iVillage dermatology expert Doris Day, M.D. says that part of the problem is that the lips don’t have oil glands to produce a layer of protection. “That’s why you don’t normally get breakouts on your lips,” she says. Avoiding salt-covered foods, like chips or pretzels, will help. But whatever you do, don’t lick your lips! “It initially feels like it’s hydrating,” says Day, “but the cold wind and air quickly sap that hydration, leaving you feeling even dryer than before.” Your best bet is to seek out products like Vaseline that will lock moisture in and create a barrier to protect your lips from the cold and the heat.