Bad breath, commonly referred to as halitosis, usually originates from one of two sources that is certain foods we eat or the breakdown of food particles by bacteria which inhabit the mouth.
Lots of people had the bad experienced where they eat a meal and then suffer with embarrassing bad breath. What cause the bad breath are sulfur compounds that were found in certain foods that have quite strong such as garlic. These sulfur compounds cause breath to smells really bad.
When we eat, sulfur compounds from foods are absorbed by our digestive systems. Sulfur compounds do not cause bad breath as a result of working their way back up into the mouth from the stomach.
Rather, the sulfur compounds move from the digestive system into the bloodstream where they are carried to the lungs. Here the lungs expel the sulfur compounds from the body by way of the air that we exhale. Amazingly, many of these sulfur compounds are also excreted in sweat from the skin and in urine for hours to even days after the food containing them is eaten.
What you can do to overcome these bad breath problems is to avoid foods that cause bad breath such as onions, or you can use some new products in the market which can neutralize the sulfur compounds.
A major advancement in the treatment of bad breath has been the finding that bacteria which causes bad breath can reside on the tongue - especially the back of the tongue! In fact, as much as 50% of the bacteria within the mouth can be found here. For bacteria the tongue is a lush velvet carpet in which they can escape the wrath of the toothbrush and dental floss.
During each brushing you should remove bacteria from your tongue with one of several commercially available tongue cleaners. What you will scrape off with the tongue cleaner is a whitish layer of bacteria, plaque, and food debris. This simple procedure can greatly improve the condition of your breath.
An important fact to remember when battling bad breath is that saliva. A dry mouth represents the perfect environment for odor causing bacteria. Saliva acts as nature's mouthwash by keeping the mouth moist, washing away bacteria, and dissolving foul smelling volatile sulfur compounds. Gums that bleed easily may be the source of odor through decaying blood. Good oral hygiene through brushing your teeth at least twice daily, and brushing your tongue as well, is helpful. If your gums bleed easily or you have simply not seen a dentist in some time, a visit would be wise.
Odors due to cigarette smoking, alcohol, garlic, and onions may originate from the lungs. Moderation in drinking and quitting smoking makes great sense for this and other more compelling reasons.

In short, you could get rid of bad breath problems by:
• Stay away from certain foods that are known to cause bad breath
• Remove bacteria and food particles by brushing your teeth and flossing
• Remove bacteria from the tongue
• Make sure that your mouth does not become too dry (maintaining saliva flow)