Sinus problems: Sinus congestion or low grade infections can cause bad breath. It would be good to have an ENT doctor look at your mouth and check your sinuses.
Answered 6/10/2014
6.1k views
Other sources: You may have sinus problems, or stomach problems. Don't limit halitosis to just your mouth. That is just where the odor is coming from. Although many times is a dental or hygiene problem.
Answered 10/3/2016
5.6k views
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