To put it simply the mouth acts a little like a cars exhaust system so if the products in have a strong odour then when they have passed through the body they will have retained much of that odour when expired.

This is why if you eat foods with a strong odour then brushing your teeth, flossing and mouth washes cannot change the smell from your breath if it being expired as air.Clearly you will not get rid of that smell until the foodds have passed totally from your body.

It is even possible for people to have eaten foods like garlic to actually expire the smell through the pores of their skin.

Why Do Poor Habits Cause Bad Breath?

If you don't brush and floss your teeth daily, food particles can remain in your mouth, which promotes bacterial growth between teeth, around the gums, and on the tongue.

This causes bad breath. In addition, odor-causing bacteria and food particles can cause bad breath if for example dentures are not properly cleaned.

Other habits like smoking tobbaco products or chewing tobacco-based products can also cause bad breath, stain teeth, reduce your ability to taste foods, and irritate the gums.

What Health Problems Are Associated With Bad Breath?

Continual bad breath or a nasty taste in your mouth may be indication of gum (periodontal) disease. Gum disease happens with the buildup of plaque on teeth. The in the mouth bacteria promote toxins in the mouth, these can lead to irritation of the gums.

If gum disease continues untreated, it can damage ultimately the gums and jawbone and cause the teeth to fall out.

Other causes of bad breath could be poorly fitting dental appliances, yeast infections of the mouth, and dental caries.

The medical condition dry mouth (also called xerostomia) is also known to cause bad breath. We all need saliva to moisten ,lubricate and cleanse the mouth by neutralizing acids produced by plaque and washing away dead cells that accumulate on the tongue, gums, and cheeks.

If not these acids are not removed, the protein in the cells can decompose and can cause bad breath.

Most common reason for a dry mouth are the side effects of some medications, salivary gland problems, or continuous breathing through the mouth which may mean their are sinus problems.

There are a wide range of other diseases and illnesses may cause bad breath but these are far less common than causes due to dental hygiene.

Such diseases include respiratory tract infections such as pneumonia or bronchitis, chronic sinus infections, postnasal drip, diabetes, chronic acid reflux, and liver or kidney problems.