Causes of Chapped, Dry Lips and How to Treat Them
6. Mouth Breathing
Having a cold can cause or exacerbate dry lips because nasal congestion prompts excessive mouth breathing that dries out the lips. Every exhale exposes the lips to warm, dry air that draws away necessary moisture. People who naturally breathe through their mouths, particularly when sleeping, can also experience chronic dry lips, whether or not they are sick.
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