Halitosis, also known as bad breath, is a common symptom of poor oral hygiene and several other causes including tobacco use, infections, and dry mouth. This condition is more common than you may think. Approximately 80 million Americans suffer from chronic halitosis and 90% of it originates from the mouth and airway passages. Fortunately, with a better oral hygiene routine among other lifestyle changes can help to freshen breath and prevent halitosis. Read on to learn more about this condition and the reason behind it.