Unfortunately, it is possible to have dead teeth, and these could be likened to turrets without a crew. Their defences are gone and the enemies from outside are able to invade. No one is left to carry out repairs; no one is there to replace the damaged calcified tissue of the dentine or to take care of regenerating what becomes defective. Such a tooth may be repaired and closed up from outside, but if the dentist does not sterilise everything properly, bacteria may spread again inside the tooth and sooner or later cause its destruction. The only protection still left is the cementum around the root. Also surrounding the root is a network of nerves and blood vessels.
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