Decay shows up on X-Rays as a dark area. The decay under these crowns extended into the nerve channel in the center of the tooth (pulp). When the nerve dies, the decomposed tissue leaks out the end of the root and causes bone loss. A dark area (bone loss) can easily be seen around the end of one of the roots. These teeth were saved with root canal therapy (Fig. 2) and new crowns (Fig. 3) Note how the the area around the root has healed.
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