Most adults will suffer from some degree of bad breath at some time in their lives.

Myths abound on its cause and treatment. Here are some of the facts:

• It is easy for someone to tell if their own breath smells
  FALSE. We cannot smell our own breath because we become accustomed to our own smell.
• Bad breath comes from the stomach
  FALSE. Only in rare cases do stomach or digestive problems contribute to bad breath. Most bad breath comes from the back of the mouth.
• Tooth brushing will always eliminate bad breath
  FALSE. Good brushing and flossing habits will help reduce bad breath. However, most people do not brush their teeth properly as it takes nearly 3 minutes to do so and most spend 45 to 60 seconds. Furthermore, bad breath can come from bacteria residing deep within crevices on the back of the tongue and thus a tongue scraper is required.
• Mouthwashes are effective in treating bad breath
  FALSE. Mouthwashes will only provide temporary relief from bad breath. In fact, most mouthwashes contain alcohol, which has a drying effect in the mouth allowing bacteria to grow better. There are newer mouthwashes without alcohol as well as those which have compounds that react with and neutralize odorous volatile sulfur compounds produced by bacteria in the mouth.
• To prevent bad breath we should focus on the food we eat
  POSSIBLY. Temporary bad breath most commonly comes from the foods we eat such as onions, garlic and cabbage which will produce high amounts of sulfur compounds. The digested sulfur compounds are absorbed and carried by blood into the lungs where they are exhaled to produce bad breath. However, chronic bad breath is most commonly caused by bacteria that break down food debris left in the mouth.

What are the causes of bad breath?
Bad breath is a common problem that can be due to many causes.

1. Inadequate oral hygiene. Poor oral hygiene from infrequent brushing of teeth or cleaning of dentures will lead to food debris left in the mouth, around teeth, on dentures, tongue and cheek surfaces, which will be broken down by bacteria resulting in unpleasant breath.
2. Foods that cause odor. Most commonly, the smell is a result of breakdown of proteins by various bacteria in the mouth. For example, volatile sulfur compounds and other substances like cadaverine and putracine are produced by certain anaerobic bacteria . Foods including garlic, onions and some spices as well as tea and coffee can contribute towards bad breath.
3. Tooth decay or periodontal (gum) disease. Gum disease and tooth decay will often lead to accumulations of bacteria that can cause bad breath. If there is gum disease or tooth decay, then treatment should be sought to eliminate these problems first. Your dentist will examine you and take some radiographs (Xrays) to check for the presence and extent of such problems. Early detection, diagnosis and treatment of gum disease and tooth decay will help keep teeth functional for life. Preventive maintenance is essential to ensure continued good oral health.
4. Prolonged mouth dryness
5. Use of tobacco products
6. Sinus or respiratory infections
7. Medications e.g. antidepressants, diuretics (used for high blood pressure)
8. Medical disorders e.g. GERD, chronic tonsil infections
9. Certain bacteria that produce foul smelling compounds. The bad smell can also come from the back of the surface of the tongue. The scraping obtained by the dentist from this portion of the tongue may suggest that this may be the primary source of bad breath in the individual. In such cases, it will help to use a tongue scraper daily to clean the tongue surface and reduce and prevent the accumulation of bacteria and foul smelling, bacterial products.

Possible causes of various problems:

Problem: Odor after fasting, dieting, prolonged speaking, exercise, sleeping or taking medications.
Possible Cause: Dryness in the mouth caused by insufficient saliva flow.

Problem: Gums that bleed and bad breath.
Possible Cause: Gum disease caused by poor cleaning between teeth.

Problem: Odor when talking.
Possible Cause: Postnasal drip onto back of tongue.

Problem: Small whitish stones with foul odor appearing on tongue.
Possible Cause: Tonsilloliths from crypts in tonsils.

Problem: Odor appears suddenly from mouth of young child.
Possible Cause: Onset of throat infection.

Problem: Odor in denture wearers.
Possible Cause: Dentures kept in mouth all night or not cleaned properly.

Problem: Odor from nose.
Possible Cause: Sinusitis, polyps, dryness, foreign body, hindered air or mucous flow.

Problem: Bad taste all day long.
Possible Cause: Poor oral hygiene, gum disease, excessive bacteria on tongue surface.

Can bad breath be treated?
The key to effective treatment and management of this condition is proper diagnosis. Recent research has enabled dentists to understand the causes of bad breath and therefore treat it more effectively. The main problem is accepting that one has bad breath as most individuals cannot smell their own breath. Asking friends or seeking other's opinion is usually the best way. If flossing, brushing and tongue combing do not resolve the problem, then you will need to investigate further.

The DOs and DON'Ts of bad breath
DO...

• Check with family or friends on the status of your breath
• Floss and clean between your teeth as advised by your dentist
• Brush your gums and teeth using the proper technique
• Practice regular cleaning of your tongue, either by scraping or brushing
• Visit your dentist and have your teeth cleaned regularly
• Use a mouthwash regularly that doesn’t contain alcohol
• Drink plenty of liquids
• Chew gum that doesn’t contain sugar (xylitol is the exception) especially when your mouth feels dry. Alternatives include parsley, mints, fennel seeds or dill seeds.
• Clean your mouth after eating or drinking milk products, fish or meat
• Keep your dentures clean and soak them overnight in antiseptic solution
• Eat fibrous vegetables and fruits to stimulate saliva flow and reduce accumulation of food particles.

DON'T...

• Ignore the problem
• Drink too much coffee
• Let young children use mouthwash as they tend to swallow it
• Rely solely on mouthwashes. Practice good oral hygiene and eating habits
• Let your concern about bad breath affect your life adversely.