Bad breath are attributed to the presence of bacteria.

Approximately 80% of cases of bad breath are attributed to the presence of bacteria that produce sulfur gases, because it has determined that folds into a space between tongue and teeth and gums nest thousands of so-called anaerobic bacteria (do not require oxygen to live) which break down proteins and carbohydrates in food, blood, secretions, mucous and dead cells inside the cheeks producing gases pestilence, such as hydrogen sulfide and methyl merchantman. This is usually presented by failing to follow proper oral hygiene and constant (three times a day or after eating some food), as this allows the bacteria are supplied from food leftovers and decompose; this adds to the habit of smoking, which also cause bad breath injures the gums. These factors promote the development of certain ailments, which have in common halitosis or bad breath, among them are:
Cavities. Infection that gradually destroys teeth.