There are a number of causes of bad breath, including.

* Poor oral hygiene
* Gum disease (e.g. boiling, abscesses, gingivitis)
* Multiplication of bacteria that cause odor in the mouth and digestive area
* Candidiasis
* Chronic infection of the sinus cavities
* Certain medications (especially those that cause side effects such as dry mouth)
* Smoking
* Certain foods can cause bad breath (garlic, onions, anchovies, high protein diet)
* Poor digestion and liver inactive
* Constipation