Causes of bad breath
Gum disease and plaque buildup are very common causes of persistent bad breath. Poor oral hygiene, tobacco use, and genetics can all contribute to these conditions.
Inadequate water intake, breathing through your mouth, certain medications, and living in a dry climate can all cause dry mouth, which can often result in bad breath.
Other Health Issues
Acid reflux, infections in the oral cavity, and inflammation of the ear canals, sinuses, and throat can lead to chronic bad breath. Some cancers can also result in a foul mouth odor.