Causes of Bad Breath

Certain foods, tobacco, alcohol and some prescription or over-the-counter drugs may cause mouth odours. In a small percentage of cases, bad breath may have a systemic origin (something that affects the body generally) such as respiratory tract condition or other ailments.

However, a major source of bad breath in healthy people is microbial deposits on the tongue especially the back of the tongue where a bacterial coating harbours organisms and debris that contribute to bad breath. Some studies have shown that simply brushing the tongue reduced bad breath measurements by 70 percent.

Food stuck between teeth, around the gums and on the tongue may leave an unpleasant odour as it decays. Dentures that are not cleaned properly also can harbour odour causing food and bacteria.

Certain foods such as garlic and onions contribute to objectionable breath because they contain odour causing compounds. When these compounds enter the bloodstream, they are transferred to the lungs where they are exhaled. Using mouthwash temporarily masks mouth odour. Few studies have examined the long term effectiveness of a particular mouthwash on reducing bad breath.

Periodontal disease, a condition in which bacteria attack the tissues that surround and support teeth may play a role in creating bad breath.

Dry mouth, or xerostomia (pronounced 'zero-stov-me-uh'), is another condition that can cause bad breath. Under normal conditions, saliva removes many particles that cause odour. Dry mouth occurs when the flow of saliva decreases. Some medications, salivary gland problems or continuous mouth breathing also may contribute to bad breath. If you have dry mouth, our participating dentists may prescribe artificial saliva or suggest using sugarless lollies and increasing your fluid intake.

Tobacco products cause bad breath, stain teeth and irritate tissues.

If our participating dentists rule out the above causes and you practice good oral hygiene including thorough tongue brushing, bad breath may be the result of a local infection in the respiratory tract (nose, throat, windpipe, lungs), chronic sinusitis, postnasal drip, chronic bronchitis, diabetes, gastrointestinal disturbance, or a liver or kidney ailment. If your mouth is healthy, you may be referred to your family doctor or a specialist to determine the cause of your bad breath.