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Adverse effect of internally bleaching an endodontically treated tooth

 # Which of the following is the most likely adverse effect of internally bleaching an endodontically treated tooth with superoxide?
A. Weakening of the remaining tooth structure
B. External cervical root resorption
C. Reinfection of the canal
D. Demineralization of tooth structure



The correct answer is B. External cervical root resorption.

The most common side effect of internally bleaching a tooth with superoxide is external cervical root resorption. 

The presence of a glass ionomer barrier over the root filling material may help to reduce the instances external cervical root resorption if it is at least 4 mm in thickness. 

The walking bleach technique using sodium perborate is NOT associated with external cervical root resorption. 

Bleaching dentin does NOT weaken the tooth structure. 

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