About 90% of the most common forms of diseases affecting the teeth and gums (caries, gingivitis and their consequences), are caused by microorganisms commonly found in the mouth and can therefore be kept under control through proper oral hygiene. The remaining 10% concerns about cancer (for which the key is early diagnosis), trauma and iatrogenic disease, or carelessness, negligence and imparities doctors. The mouth is a complex ecosystem in which thrive more than a hundred species of microorganisms, tiny living things that are born, they feed, breed, emit waste and die. Most of them are saprophytic that is essentially harmless. Under certain conditions, however, can become harmful. (more…)