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Dry mouth can lead to persistent bad breath because reduced saliva allows odor-causing bacteria to grow more easily. Common causes include dehydration, certain medications, mouth breathing, smoking, and poor oral hygiene. Effective ways to manage it include drinking more water, using alcohol-free mouthwash, cleaning your tongue, chewing sugar-free gum, and maintaining regular dental care. Treating the underlying cause of dry mouth is key to achieving long-lasting fresh breath.