Pt presented with persistent sinus tract on B. RCT’s done by another endodontist in town. They were suggesting to start endo in #26 followed by apico if that did not work. That’s when she decided to go for another opinion. I retreated #23 and 24, CaOH for at least 6 weeks, with no luck. Sinus tract just would not heal. Then I suggested decompression after final obturation. Irrigation was done for about 5 weeks.