Last week i had a patient with interesting anatomy of lower first premolar. She came to my office with RVG (first on the left). You can see broken lentulo spiral (red arrow) and missed canal (green arrow). Middle RVG is after my first appointment - i shaped missed canal and try to remove lentulo. After 1,5 hour "fighting" i gave up and dressed canals with calcium hydroxide. Right RVG is just after second appointment with removed lentulo and filled canals. Hope You enjoy!