This study aims to evaluate the incidence and intensity of postoperative pain in patients undergoing root canal treatment on teeth diagnosed with pulpitis, pulp necrosis, or with previous endodontic treatment. Teeth will be obturated using either bioceramic or resin-based sealers. The primary objective is to determine whether the type of sealer significantly influences the level of postoperative pain as reported by patients. Pain intensity will be assessed using the Visual Analogue Scale (VAS) at three time points: immediately after treatment, 24 hours, and 72 hours postoperatively. The findings are expected to provide clinical insight into which obturation material may be more effective in minimizing postoperative discomfort.