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Illustrations: How A Tooth Decays
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1. Healthy

Tooth |
2. White

Spots |
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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.
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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.
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5. Pulp

Involvement |
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| 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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