A tooth becomes nonviable after its pulp dies.
(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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