Laser Activation in Reducing Pain During and After Root Canal Treatment for Painful Lower Molar Teeth.

Inclusion Criteria: * Patients with painful mandibular molar teeth due to caries with no history of medication intake before 7 days prior to root canal treatment * Patients who respond exaggerated pain with or without lingering response on cold test Exclusion Criteria: * Patients who do not have pain upon access opening following local anesthesia administration * Teeth with poor periodontal or restorative prognosis, * Patients with serious systemic ailments or conditions hindering single visit root canal treatment * patients not willing to participate in the post operative recall evaluation * Teeth with anatomic variations and * Allergic patients are excluded