The specific odor of breath can vary depending on the cause of the problem. It is best to ask a close friend or relative to gauge your mouth odor as it is very difficult to assess it yourself.
If no one is to hand, one way of checking the odor is to lick your wrist, leave it to dry and then smell it. If it smells bad, there is a strong chance your breath also smells bad.
Some individuals are concerned about their breath even though they may have little or no mouth odor; this condition is called halitophobia and can lead to obsessive mouth-cleansing behavior.
Causes of bad breath...
One of the major factors involved in bad breath is cigarette smoke.Potential causes of bad breath include:
Dr. James L. Johnson