The most common cause of bad breath is dental plaque or food particles trapped in the cavities or between the teen. Fortunately, this type of bad breath is easily cured by brushing and flossing the teeth.
When you skip a meal, bacteria that would be cleared away by chewing and salivation linger in the mouth and an cause bad breath. But there are other more important causes of halitosis. Eating pungent foods, such as garlic or onion, can foul the breath. As these foods are digested and enter the bloodstream, their odour passes through the lungs into the breath.
Finally, bad breath often accompanies gum diseases. In fact, if you have persistent bad breath that does not clean up with good oral hygiene, see your doctor or dentist. It could be a sign of a serious underlying medial problem.