Dental caries (tooth/teeth cavities) afflicts most of us at some point in life and is the second most common condition in humans after the common cold and flu. A tooth cavity is the gradual breakdown of the tooth structure due to microbial growth. Erosion of the outer lining of the tooth (enamel) is followed by the destruction of the inner layer (dentin).

A tooth cavity occurs as a result of a combination of factors.
- Food particles get trapped on and between the teeth after eating.
- Along with mucus, dead epithelial cells (from the mouth lining) and bacteria, a thin soft film, known as plaque coats the teeth.
- This provides the ideal medium for oral bacteria to feed upon food debris.
- Bacteria like Mutans streptococci and related groups, break down food particles and produce lactic acid as a byproduct. It is this lactic acid that is responsible for eroding tooth enamel and causing tooth cavities.
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