In fact a single human mouth can contain more microorganisms than there are people on planet Earth. While you can't sterilize your mouth, you can minimize your potential for having tooth decay. You do this by not allowing the bacteria that are present to form organized colonies. These bacterial colonies are referred to as "dental plaque." Dental plaque not only provides a home for oral bacteria but it also acts as a medium that holds the acid they produce directly against a tooth's surface. Take a look at our diagram to the left. When acid production is active (when we consume sugar) some of the acid that is formed will seep from the dental plaque's surface and into our mouth.
This isn't the acid that will cause tooth decay. Any acid finding its way into our mouth will get diluted, buffered, and/or washed away by saliva and the foods and beverages we eat and drink.
The acid that is instrumental in demineralizing a tooth's surface, and therefore causing tooth decay, is the acid that seeps in the opposite direction, on through the plaque and down to the tooth's surface. This acid will lie underneath the dental plaque and directly against the tooth. And because the dental plaque covering over this acid will act as a protective layer there is less effective dilution, buffering, and washing action produced by saliva. This in turn means that the acid will tend to remain in very concentrated form (a pH of 4 and lower) for quite some time after it has been created, and therefore tooth demineralization will take place for an extended period of time also. With time saliva will penetrate through the dental plaque and begin to have its neutralizing effect on the acids that have been created in response to the sugary meal. But this can take as long as two or more hours. The amount of tooth demineralization that takes place after an exposure to sugar is in part related to the age of the dental plaque. Characteristics such as the thickness, chemical nature, and types of bacteria living in dental plaque correlate with its age. Plaque that is only a few hours old will not be able to produce as much tooth demineralization as plaque which is several days old (when each is provided with an identical exposure to sugar).
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