![]() 1. Healthy ToothEnamel is the hard outer crystal-like layer. Dentin is the softer layer beneath the enamel. The pulp chamber contains nerves and blood vessels. It is considered the living part of the tooth. |
![]() 2. White SpotsBacteria that are exposed to sugars or carbohydrates can make acid. The acid attacks the crystal-like substance in the tooth's outer surface. This process is known as demineralization. The first sign of this is a chalky white spot. At this stage, the decay process can be reversed. Using fluorides at home and in the dental office can help the tooth repair itself. |
![]() 3. Enamel DecayDemineralization continues. Enamel starts to break down. Once the enamel surface is broken, the tooth can no longer repair itself. The cavity has to be cleaned and restored by a dentist. |
![]() 4. Dentin Decay |
![]() 5. Pulp Involvement |

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Illustrations: How a Tooth Decays
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