The prognosis of bleaching of a discoloured tooth is good in all the given conditions except:
Correct Answer: Discolouration due to metallic salts.
Description: The prognosis for bleaching of a discolored pulpless tooth is good when the discoloration is due to products of pulp decomposition, food debris, or chromogenic bacteria that gain access to the dentinal tubules. When the discoloration is due to metallic salts, bleaching is less successful.
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Dental
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