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This is a checklist that I prepared once as a result of researching independently on halitosis.

Let me give you this hint: To find the source of the problem, think about the following:

1....

Rashid F.
Bad breath might also be caused by Zenker's diverticulum which is a pouching in the esophagus. That can be checked by a barium swallow test, an esophageal endoscope, or any other way...