DEAR DOCTOR K: My breath is OK during the day, but when I wake up in the morning, it's terrible. What causes bad morning breath? And what can I do to prevent it?
DEAR READER: Bad breath, or halitosis, is a common problem -- especially "morning breath." (Some people call it "dragon breath.") Certain foods can cause bad breath. Garlic and onions are classic examples. Reflux of stomach contents can do the same. So can serious diseases of the liver or kidneys. Infections of the tonsils, sinuses or respiratory tract can also be responsible for bad breath.