Calculation. It causes inflammation of gums and tooth loss.

Decrease in saliva. There are people who tend to suffer from dry mouth due to administration of certain medications (e.g. antihistamines), drink little water, breathing through the mouth, snoring, stress and suffering have advanced age. Gingivitis. Infection of the tissue that supports the teeth, which manifests itself with chronic inflammation, irritation and bleeding.
Periodontal disease. It extends until the pulp of molars and teeth, causing bleeding, pain and redness of gums, feeling that they become flaccid, secretion of pus and loss of teeth.
It is noteworthy that many times bad breath is caused by the consumption of certain foods and liquids, such as garlic, onions, fish, milk, egg, seasoning, cabbage, broccoli, coffee and alcohol, since these fragrant substances that contain edible roam the bloodstream and ending exhaling through the mouth.
In turn, strict diets or so-called "hunger" also cause bad breath because they give rise to a state known as ketosis, which is characterized by inducing the production of acid in the blood because the body does not receive adequate input carbohydrates and has to rely on fat stored in the body for energy.
But that's not all, because the stomach has also come to have some involvement, then there are those who suffer gastric slow traffic, that is, the process of degradation and exploitation of food takes longer than normal, so that bacteria gases and unpleasant odors remain in the stomach area longer. The same thing happens when there is not enough stomach acid, which helps the digestive process.
Other causes of bad breath include some ailments such as diabetes, malfunction of the liver, lung and respiratory diseases, (sinusitis, inflammation of tonsils, pneumonia or deviation from the wall), kidney disorders, gastritis, colitis, ulcers, regurgitation or reflux of food from the stomach into the esophagus. In addition, there are chronic cases arising from local disturbances, the most common is when someone has tonsil crypts with, that is, small openings that accumulate in the remains of food that often fall into a state of decomposition.