•  morning breath - saliva flow slows down during sleep, bacteria accumulates and grows
• Foods - such as onions, garlic, foods that contain odor causing compounds enter the blood stream and are transferred to the lungs and exhaled
• poor dental hygiene - food basically rots in the mouth and is covered by bacteria which release sulfur compounds
• Dry Mouth Syndrome - xerostomia is caused by medications, certain disease, like Sjogren's syndrome, HIV-AIDS, Diabetes and Parkinson's disease.  Also radiation and chemotherapy as well as nerve damage to the salivary glands
• Smoking or tobacco products
• Dehydration, hunger and missed meals
• Diet such as Atkins can give your breath an acetone odor
• Medical Conditions- Diabetes, liver and kidney disease, chronic sinus infections, bronchitis, and pneumonia.

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    BRUSH, FLOSS, RINSE, BRUSH, FLOSS, RINSE

• Brush your teeth 2-3 times daily.  Floss your teeth daily.
• Use an antibacterial rinse like Listerine, Crest ProHealth or Breath Rx.
• Use a tongue scraper to remove bacteria from the very back of your tongue where the bacteria live. 
• Get a check up by your dentist.  Open crown margins, broken teeth, fillings that are open or rough, food traps between teeth, and untreated gum disease all cause breath odor.
• Make sure you don't have tonsil stones, a sinus infection, or lung infection.
• Check with your physician to see if you have a metabolic disorder such as diabetes, liver disease, or other metabolic diseases.
• Avoid having a dry mouth.  Drink plenty of fluids, chew gum or use a sugar free breath mint.