Objective: To compare post obturation endodontic flare-ups following single and multiple visit root canal treatment. Study Design: Quasi experimental study. Setting Operative dentistry department, DOW university hospital Karachi. Period: 2nd October 2017 to 2nd April 2018. Material & Methods: A total of 100 patients of permanent exposed anterior teeth with positive pup response / vital, either gender were included. Patients divided into two groups according to single and multiple visit root canal treatment. At each post obturation recall visit the patients were interviewed and inspected to determine whether or not there are symptoms. Results: A total of 100 patients came for root canal treatment. At 1st post obturation day, out of 50 patients treated in one visit, four experienced a flare-up (8%). Out of 50 patients treated in two visits, eight experienced a flare-up (16%) (P-value=0.12). At 3rd post obturation day, out of 50 patients treated in one visit, three experienced a flare-up (6%). Out of 50 patients treated in two visits, five experienced a flare-up (10%) (P-value=0.37). Conclusion: We conclude that almost same results for single and multiple visit endodontics were achieved not statistically significant.