7. Dental Problems
Many times, bad breath is due to certain dental problems.
Persistent bad breath or a bad taste in the mouth may be a warning sign of a dental issue, such as an abscessed tooth, gum disease, cavities or bad oral hygiene. In fact, unbearable breath may be the first symptom of such problems.
Most of these dental issues are caused by odor-producing bacteria that affect your teeth and gums.
Along with oral health problems, bad breath can also be caused by poorly fitting dental appliances, such as dentures.
8. Digestive Problems
Several digestive problems can cause bad breath.
The common problem of gastroesophageal reflux disease (GERD) can cause stinky breath. This condition is caused by stomach acid coming back up the esophagus, causing a burning sensation in the chest or throat. When the acids come into the mouth, it causes bad breath.
Stomach ulcers can also cause bad breath. A 2008 study published in the Journal of Medical Microbiology reports that bacteria that cause stomach ulcers and cancer could also cause bad breath.