Hepsenoglu YE, et al. - Researchers assessed the postoperative pain after single-visit and 2-visit non-surgical endodontic retreatments with 2 different intracanal medicaments. Fewer incidences of postoperative pain were provided by single-visit nonsurgical endodontic retreatment vs 2-visit nonsurgical endodontic retreatment based on assessments ranging from 1 day to 1 month. At the 1-month assessment, they noted a significantly higher postoperative pain in both the calcium hydroxide group and the chlorhexidine (CHX) group vs the single-visit group.