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

Inclusion Criteria: * Patients older than 18 years. * Patients who demonstrate understanding of the study and willingness to participate as evidenced by signing the voluntary informed consent and who received a signed and dated copy of the informed consent form. * Patients who understand and are willing to comply with all study procedures and restrictions. * Absence of clinically significant and relevant abnormalities in the clinical history or oral examination. * Endodontic treatment considered the treatment of choice for both multi and single rooted teeth. * Endodontic retreatment considered the treatment of choice only in posterior molar teeth (multirooted). * Only one treatment per patient. Exclusion Criteria: * Patients who are allergic to any of the materials used in the treatment. * Patients with heart pacemaker. * Patients with any general pathology that requires antibiotic prophylaxis. * Root resorption, root fractures, impossibility of restoration. * Pregnant patients. * Patients who took painkillers in the last 6 hours. * Case where apical patency couldn't be achieved * Cases where final obturation quality is compromised. * Any intra operative factor that complication that can compromise the treatment outcome like root perforation or fractured instrument or inability to localize/prepare any canal.