dental plaque:

Dental plaque is a biofilm, usually a pale yellow, that develops naturally on the teeth. Like any biofilm, dental plaque is formed by colonizing bacteria trying to attach themselves to a smooth surface (of a tooth). ……. This allows a numerous amount of microorganisms to adhere to the surface of teeth for long periods of time[3]. These multiple species of bacteria become dental biofilm. Dental biofilm, more commonly referred to as dental plaque, is composed of about a thousand species of bacteria that take part in the complex ecosystems of the mouth.

http://en.wikipedia.org/wiki/Dental_plaque

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