H Healthy, sound teeth function more effectively. In the field of dentistry, cases of tooth decay that have reached the pulp tissue are frequently encountered. Furthermore, many teeth that have already undergone treatment continue to cause pain; this is often due to periapical pathology or incomplete root canal filling. To achieve a perfect root canal filling, it is essential to understand the correct procedural stages of a pulpectomy (the complete removal of pulp tissue). One of these stages is the determination of the working length.