A tooth becomes nonviable after its pulp dies.


Clinical features:

(1) The tooth becomes darker than adjacent teeth that are viable.

(2) The tooth is insensitive to all stimuli (application of ice, etc)


Barriers to detection:

(1) poor oral hygiene or tooth discolorations may make detection of the color change difficult

(2) multiple devitalized teeth may show the same color

(3) depressed level of consciousness or coma


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