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Bad breath is caused by Anaerobic Sulfur Producing Bacteria which normally live within the surface of the tongue and in the throat. These bacteria are supposed to be there, because they assist humans in digestion by breaking down proteins found in specific foods, mucous or phlegm, blood, and in diseased or "broken-down" oral tissue. Under certain conditions, these bacteria start to break down proteins at a very high rate. Proteins are made up of Amino Acids. Two of the Amino Acids (Cysteine and Methionine) are dense with sulfur.

When these "beneficial" bacteria come into contact with these compounds, the odorous and "lousy-tasting" sulfur compounds are released from the back of the tongue and throat, as Hydrogen Sulfide, Methyl Mercaptan and other odorous and bad tasting compounds. These "problem" compounds are often referred to as Volatile Sulfur Compounds (VSC), where volatile means Vaporous and Effervescent, two adjectives which accurately describe their ability to offend other people instantly

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