Persistent dry mouth, characterized by thirst, soreness, difficulty eating, and bad breath, can be a symptom of underlying conditions like Sjogren's syndrome or diabetes, according to NHS guidance. While often manageable at home and exacerbated by lifestyle choices such as alcohol and caffeine consumption, chronic dryness warrants medical attention. Other causes include dehydration, certain medications, oral thrush, and cancer treatments. Staying hydrated and stimulating saliva production through sugar-free gum or candies can help alleviate symptoms.