Aims: The aim of the present study is to evaluate the paper point technique (PPT) in curved canals, comparing this technique with the traditional electronic apex locator (EAL) evaluation. Materials and methods: A total of 100 root canals with at least 30° of curvature according to Schneider's criteria in unsalvageable lower molars were evaluated in the present study. The working length (WL) was measured comparing traditional EAL evaluation and PPT, as described in the literature; therefore, the maximum length a paper point returned dry, without any visible sign of wetness, was recorded as the canal length according to PPT. All statistical analyses were performed using student's t-test. The significance level was set at p < 0.05. Results: Between mean final EAL-WL (19.8 ± 0.4 mm) and mean paper points technique WL (19.2 ± 2.4 mm), there was a statistically significant difference, p < 0.05. Conclusion: The present study found that PPT is not suitable for estimating the location of the apical foramen (AF) in curved canals. Despite the fact that the mean WL determination using the PPT was only 0.5 mm short of the WL determined with the apex locator, the results showed a high variability witnessed by the high standard deviation (SD), making the proposed technique unpredictable. Clinical significance: The PPT alone cannot be considered a valid tool for WL determination. Despite this, it could be a valid support to confirm the EAL-WL, replacing the periapical X-radiation (X-ray) with instruments placed at WL and reducing this way the X-rays for the patient.