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When RCT was done, the tooth #9 was still the darkest (Fig.9). The access for #8 had been closed with the whitest composite (*), whereas the one for #9 was closed by cotton pellet and Cavit. The latter were going to be removed for internal bleaching 1-2 days later (when endodontic paste completely sets).
Xin Wei, DDS, PhD, MS 1st edition 10/29/2014, last revision 10/30/2014