Persistent bad breath, even when dental causes have been ruled out is quite often linked to issues beyond the teeth, especially in the throat, nose, or stomach. A very common reason is post-nasal drip, where mucus from sinus or allergy problems collects at the back of the throat and produces an unpleasant smell. Another frequent cause is tonsil stones, which are small deposits trapped in the tonsils that can release a strong odour even when the mouth looks completely normal. Acid reflux is another important possibility, where stomach acid gently moves up toward the throat and leads to a bad taste and ongoing breath issues. In some people, dry mouth, irregular digestion, or mild throat inflammation can also contribute to the problem. Since mouthwashes and even stronger rinses have not helped, it suggests the source is likely not in the oral cavity itself. An ENT specialist evaluation can help check the tonsils, nasal passages, and signs of reflux. Simple steps like staying well hydrated, avoiding late-night meals, and managing acidity or allergies can support improvement, but identifying the exact cause is the key to long-term relief.