DECAY 1

Tooth decay (dental caries) is an infectious disease caused by bacteria (Streptococcus Mutans) in the mouth that feed off fermentable carbohydrates (sugars and starches) in the food we eat. A byproduct of this process is the production of acid that demineralizes the tooth structure.

Decay can affect any part of the tooth or root. The most common areas affected are usually the occlusal (biting) and interproximal (between the teeth) surfaces. Interproximal decay is shown on diagram.

DECAY 2

A typical decay pattern usually starts as a small lesion in the enamel which then spreads to the underlying dentin. Once in the dentin, the decay usually progresses at greater rate than in the enamel.

The rate of decay varies with each individual and is dependant upon such factors as oral hygiene effectiveness, amount and composition of bacteria, saliva flow and intrinsic strength of the tooth structure. In additon, some genetic conditions can create compromised tooth structure during its development.