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Illustrations: How A Tooth Decays

1. Healthy

Tooth
2. White

Spots
Acid from bacteria in the mouth has started to leach minerals from the enamel in a process called "demineralization." This earliest stage of decay is reversible.

3. Enamel

Decay
4. Dentin

Decay
Demineralization continues. Enamel starts to break down. The decay reaches into the dentin where it can spread and undermine the enamel.

5. Pulp

Involvement
If decay is left untreated, it will reach the tooth's pulp, which contains nerves and blood vessels. The pulp becomes infected. An abscess can form in the tissues.

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