Increasing water intake to combat dehydration, protecting the lips from environmental elements, and moisturizing during sleep are methods of treating chapped lips, according to Mayo Clinic. Lip balm is advised over frequently licking the lips as saliva evaporates quickly, leaving the lips in a drier state.
The use of a humidifier returns moisture into the air, smoothing dry lips while sleeping, explains WebMD. Approximately six to eight applications of lip balm are needed throughout the day to protect against chapped lips. Petrolatum keeps moisture in, and dimethicone fills in cracked or split skin on the lips. Allergies to certain ingredients such as camphor and menthol aggravate and further dry the lips.