Bad breath (halitosis) can cause embarrassment, create social and psychological barriers , and even affect marriages. Most bad breath occurs when bacteria in the mouth break down proteins, producing foul-smelling sulfur compounds. Keeping and chewing fennel seeds in the mouth can help with bad breath.

Cause of bad breath
It can be caused by a a variety of factors and conditions. Bad breath, is caused by mainly volatile sulfur compounds as a result of bacterial breakdown of protein and can be quantitatively and qualitatively measured in the expired oral breath. In eighty to ninety percent of cases, bad breath originates in the mouth due to inadequate plaque control, periodontal disease, dry mouth, faulty restorations, and in particular due to excessive bacterial growth on the posterior third of the dorsal surface of the tongue. In the remaining ten to twenty percent of cases, chronic bad breath is caused by systemic disorders such as hepatic, pancreatic and nephritic insufficiencies, trimethylaminuria, upper and lower respiratory tract infection, medication and cases where gastric content may generate oral malodour. The methods of detecting or diagnosing bad breath are organoleptic or human sense of smell, sulfide monitoring and gas chromatography. All of these methods have limitations and disadvantages.

Common Causes
Bacteria breed inside your mouth between teeth and cover the tongue. When bacteria stagnate, they multiply and give off toxins and stinky odors>
The deep holes in tonsils, called crypts, are a common cause of halitosis. If tonsils are too wide and pitted, a cheese-like smelly substance collects in these holes. These nuggets sometimes smell, and may cause bad breath.
Foods such as onion, garlic, and fish can cause bad breath -- even hours or a day after you brush your teeth.
Any type of smoking (cigarettes, cigars, pipe) or chewing tobacco can leave you with a really nasty taste -- and smell -- in your mouth.
Sometimes GI problems such as GERD or an ulcer can cause bad breath when you burp and gas is released. Also blame low-carb diets, which cause ketosis, a fat-burning state in the body that produces dragon breath.

Role of foods:
The types of food you eat can cause bad breath, so reduce foods like garlic and onions when you plan to be in public. After being digested, a odorous substance in garlic is absorbed into your bloodstream and then transferred to your lungs, where it is expelled as a gas. Brushing your teeth and rinsing with mouthwash only temporarily hide the odor.
Not eating can also cause bad breath, so don't skip meals for prolonged periods if you are planning to be close to people.
Poor dental hygiene can lead to bad breath, so brush, floss and use mouthwash frequently to keep your breath fresh.
Dry mouth can exacerbate bad breath, so stay well hydrated, and try sucking on sugar-free candies to stimulate saliva production.
Smoking can be another cause of bad breath.
If you have persistent bad breath, consult with your doctor to determine if it is being caused by a medical condition, such as a respiratory infection, sinusitis, liver or kidney disease.

Medical conditions
Chronic lung infections and lung abscesses can produce very foul-smelling breath.
Chronic kidney disease can be a cause.
Chronic reflux of stomach acids (gastroesophageal reflux disease, or GERD) and a slight protrusion of the stomach into the chest cavity (hiatal hernia) also can produce bad breath.
Constant bad breath and gums that bleed easily are symptoms of:periodontal disease.
A sore throat, trouble swallowing, foul breath and fever are all symptoms of tonsillitis, an infection of the tonsils (the oval-shaped nubs of pink tissue on each side of the back of your throat).

Natural bad breath treatment and cure - How to get rid of it
Home remedy involves maintenance of plaque control, elimination of active periodontal disease and cleaning the tongue on a routine basis. Floss your teeth on a nightly basis. Oral rinsing with a mouthwash could be indicated in some instances, as a temporary measure. Avoiding foods that cause bad breath, such as garlic and onions, is another option to stop bad breath. If you wish to get the benefits of garlic without the bad breath, consider garlic pills. For more information on fennel herb.

Eat more fruits such as apples and oranges.
 

Bad breath product - solution
Adding magnolia bark to mints or gum can eliminate bad breath by killing most odor-causing germs. Magnolia bark extract is effective against three types of oral microorganisms, killing close to a high percentage of bad breath bacteria within a few minutes.