Objective: The objective of study was to explore the relationship of breathing and pain during endodontic therapy. Materials and methods: 500 patients who presented in the department of operative dentistry were included in the study. Numeric pain scale was used to document the pain perceived during endodontic therapy. Results were analysed using SPSS version 23. Results: Among the 500 cases, 250 cases presented with mild pain, 158 presented with moderate pain while 92 presented with severe pain. 55.4% cases were of nasal breathers while 44.6% cases were of oral breathers. Conclusion: Patients presenting with nasal breathing pattern reported with mild pain perception during endodontic therapy when compared to patients who were oral breathers. Considering life style modifications like breathing patterns, body hydration and sleep impact the patient’s life and pain management during endodontic therapy. Educating patients on proper breathing and its benefits will have positive outcome on endodontic therapy. Keywords: Oral breathing, nasal breathing, pain perception, endodontics.

Aim: To discover and relate the role of sleep with pain perception in patients undergoing endodontic therapy. Study design: The study was quantitative correlational design in nature. Place and duration of study: Department of Operative Dentistry, Dental section Islam Dental College, Sialkot. Duration of study was two years 2019-2020 Methods: Five hundred patients were included in the study, which were scheduled for endodontic therapy. Results: Five hundred patients were included in the study. The correlation between sleep and pain during endodontic therapy was -.039 which was found non-significant. 250 cases have mild pain (50%), 158 cases (31.6%) have moderate pain, 92 cases (18.4%) have severe pain. Sleep deprived cases in the study were 264(52.8%), while cases who were practicing good sleeping habits were 236 (47.25%). Conclusion: There exists a statistically significant relationship between perception of pain during endodontic therapy and sleep. In order to improve the outcome of endodontic therapy dental professionals should educate their patients on the importance of good sleep hygiene along with dental hygiene. Keywords: Sleep, pain, endodontic therapy.