Small doubts from the clinical routine. The locator points 21mm and on the cone probe, also adjusted for this length, it seems well short of the ideal. Odontometry is repeated and the same result is obtained. When obturating, the final radiograph also seems unsatisfactory, but in mesial view we can get a better idea of the apical positioning of the cone. This is why it is important to rely on a good apical locator and to know the anatomy in the region of the foramen. Most of the time it does not coincide with the radiographic vertex.