If an incipient lesion is not treated, the decay progresses to destroy the enamel to the DEJ.
The x-ray to the right shows an untreated incipient lesion on the distal of tooth #19. This interproximal lesion has a characteristic triangular shape with the apex (smallest point) going towards the DEJ. Once the lesion reaches the DEJ, it will spread laterally long the DEJ. If left untreated, the dentin will become demineralized.
In time, the decay advances towards the pulp if left untreated.
Date last modified: May 14, 2012.
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