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Plaque on your teeth is essentially a layer of bacteria. These microorganisms adhere to your teeth and produce acid as a metabolic byproduct. This acid can erode the tooth's enamel, leading to the formation of a cavity—a hole in the enamel.
A tooth is composed of three main sections:
- The outermost layer, which is extremely hard, is called enamel
- The middle layer, known as dentin, is much softer (similar to ivory)
- The innermost part, called the pulp, contains nerves and blood vessels
When acid penetrates the enamel, bacteria can quickly invade and destroy the dentin. If they reach the pulp, it results in a tooth infection, often requiring a root canal procedure.
When a dentist drills into a tooth, their primary goal is to create a well-shaped opening. This serves two purposes: first, to eliminate all decayed material from the dentin, and second, to form a cavity that allows the filling (whether silver/mercury amalgam or plastic) to adhere securely and completely.
Here are some interesting links:
- How Cavities and Fillings Work
- How Cosmetic Dentistry Works
- How Tooth Whitening Works
- How Food Works
- Healthy Teeth - oral health database for kids
- American Dental Hygienists Assocation: Oral Health Information
- SaveYourSmile.com: How to Stop Cavities and Tooth Decay
