Objective: Successful endodontic therapy requires the shaping and cleaning of the root canal system. Irrigation with sodium hypochlorite is an essential adjunct in achieving this goal. During root canal treatment, the extrusion of sodium hypochlorite is referred to as a "hypochlorite accident," which can lead to sudden and severe symptoms and may result in potentially serious consequences. To prevent such accidents, several recommendations have been proposed, including marking the working length on the irrigation needle, keeping the needle loose within the canal, avoiding excessive pressure during irrigation, using a perforated needle tip, and maintaining constant motion of the needle during irrigation.

 Case: A 22-year-old female patient presented to our department clinic with complaints of night pain in the upper right region. A diagnostic radiograph revealed a deep dentinal carious lesion in tooth #24. During the initial visit, following determination of the working length and canal instrumentation, an extrusion of sodium hypochlorite occurred. The canals were irrigated with saline under pressure, and an infiltrative local anesthetic was administered. To prevent the development of infection, antibiotics were prescribed along with analgesics for pain management. The patient was monitored with every other day follow-up visits. On day 6, intracanal dressing was reapplied, and it was decided to postpone the completion of root canal treatment until all symptoms had resolved. By day 21, percussion, palpation, and spontaneous pain symptoms had passed, thus the root canal treatment was completed, and a permanent restoration was placed during the same visit.

 Conclusion: All treatments were completed after the patient became asymptomatic. During routine follow-ups, the patient reported no pain. All treated teeth remain under observation.

 Keywords: Sodium hypochlorite, Root canal treatment, Complication