Busting Bad Breath
Bad breath is usually caused by your tongue, although the same process of bacteria breaking down dead cells and food bits can occur in other parts of your mouth, like with food stuck in your teeth. If you aren’t brushing your teeth carefully, the same bacteria will build up on your teeth and emanate an odor again. The most common reason that anyone suffers from halitosis is a dry mouth. A dry mouth occurs because you haven’t been drinking enough water or you have been sleeping or travelling, in which case your body slows down the production of saliva. A dry mouth leads to dead cells on your tongue, which bacteria break down—this process emits a foul odor that we commonly known as bad breath. Here are some of the causes of bad breath and how to fight with them.
The food we eat

We all know that onions and garlic leave behind an offensive odor. But this is only temporary. There are no foods that can be attributed to the chronic bad breath that plagues nearly 40 million people. This condition and distinct malodor is linked to elevated levels of anaerobic, sulphur-producing bacteria (VSC’s), which typically accumulate on the rough surface on the back of the tongue. So, continue to enjoy your spicy and flavorful foods … just brush thoroughly afterwards.
Bacteria in your mouth

What you eat doesn't just apply to your waistline. Some foods can trigger bad breath. If you're worried, limit consumption of foods like garlic, onions, curry, and fish. Acidic beverages like beer, wine, coffee and soda can also be a trigger. They all contain foul-odor-releasing compounds that get absorbed into your bloodstream. The odor is given off in your breath until all of the food is out of your body. Limit chocolate candy and sweets, as well. The sugar helps bacteria to reproduce in your mouth, leading to bad breath. Green tea has anti-bacterial properties that knock out the stink. Cinnamon contains essential oils that kill many types of oral bacteria.
Don’t smoke

The most immediate way that cigarettes cause bad breath is by leaving smoke particles in the throat and lungs. This effect is typical of nearly any tobacco product that involves inhaling smoke or rolling it around in the mouth. The smell of a freshly smoked cigarette can linger in the lungs for hours, hence the stale scent associated with smoker's breath. However, that's just the beginning. The chemicals in tobacco smoke can remain in the mouth, leading to a host of secondary causes of bad breath. Repeatedly inhaling hot gases parches the tongue and gums, leaving a dry, chemical-filmed environment where anaerobic oral bacteria can run amok. So avoid smoking, not for bad breath only but for complete body improvement.
Avoid dry mouth

There are several causes of dry mouth and bad breath including, but not limited to which includes daily use of medications that cause dry mouth, cancer treatment, poor dental health, illness, infection etc. Treatment for dry mouth not only increases the amount of saliva produced, but, in most cases, also takes care of its accompanying symptom, bad breath.
Other things to do

Brushing and flossing regularly including brushing your tongue to rid the mouth of dead mouth-lining cells, extra food particles, and bacteria can fix the bad breath issue. Visit your dentist regularly. Quit smoking or using chewing tobacco. Natural remedies, such as chewing mint or parsley can be solution to bad breath. Keeping the mouth moist by drinking water or chewing sugarless gum or sugar-free hard candy to stimulate the production of saliva is again useful to fight against bad breath.