Unpleasant odor from the breath 
Poor Dental Hygiene Some foods such as onions and garlic Crash dieting, fasting, and low-carbohydrate diet Certain medications Smoking Dry Mouth Syndrome Periodontitis Infections or inflammation in the nose, throat, or sinuses Liver and other types of cancers, liver failure, and other metabolic diseases 
Gastroenterologist ENT (Otolaryngologist) Dentist 
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