Bad breath is usually caused by oral bacteria
The most common cause of halitosis is the anaerobic bacteria that live in a person's mouth. For the majority of people (85 to 90% of those who have bad breath [halitosis]), the single most frequent
Causes
There are a number of causes of bad breath, foremost among them being bacteria in the mouth, stomach and intestinal disturbances, bowel sluggishness, sinus or throat infections, and tobacco and alcoho