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| - Some non-oral causes may include diabetes, kidney failure, infections of the upper respiratory tract, and sinuses, nasal cancers, lesions of the nose and nasopahrynx, hiatus hernias, esophageal strictures, liver failure, and foods such as garlic and onions, which are rich sources of VSC. Excessive dieting may also lead to bad breath, due to the increased metabolic breakdown of fats and proteins, a
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