A 52-year-old man (smoker 1 ppd) has toothache in UR.  The tooth #4 has severe Class V defect (Fig.1 *), periapical radiolucency (PARL, arrowheads) around the buccal roots and mild percussion. 

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Xin Wei, DDS, PhD, MS 1st edition 02/23/2020, last revision 10/04/2020