Effect of Intra-Canal Cryotherapy on Postoperative Pain After Endodontic Procedures

The goal of this randomised clinical trial is to evaluate the effect of cryotherapy on postoperative pain after primary and secondary root canal treatment. The main question\[s\] it aims to answer are: * Dose cryotherapy help reduce postoperative pain after primary root canal treatment. * Dose cryotherapy help reduce postoperative pain after secondary root canal treatment. Participants will be randomly divided to receive either cryotherapy or irrigation with normal saline and the effect between the two groups in terms of postoperative pain will be compared after primary and secondary root canal treatment.