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  1. Understanding Dry Mouth (Xerostomia): Causes, Symptoms & Health Risks Dry mouth, medically called xerostomia , is more than just an irritating condition—it’s a signal that your body is lacking proper hydration or salivary function. Saliva plays a vital role in digestion, oral lubrication, and bacterial control. When your mouth doesn’t produce enough of it, you may experience a sticky, dry feeling, difficulty chewing or swallowing, cracked lips, burning sensations on the tongue, bad breath (halitosis), and even voice changes. Common causes of dry mouth include: Dehydration : One of the top culprits—caused by not drinking enough fluids, excessive sweating, diarrhea, or vomiting. Medications : Over 400 common medications cause dry mouth as a side effect, including antidepressants, antihistamines, decongestants, blood pressure drugs, and painkillers. Mouth breathing : Sleeping with your mouth open, especially due to nasal congestion or sleep apnea (CPAP usage), lea...