Several types of live in our mouth and are part of a sticky substance called plaque. Improper brushing causes plaque build-up, or tartar, and will eventually cause tooth decay.

Bacteria

answer; /// i believe the name your looking for is called (plaque)or check good luck

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this