#26 (14) with leaky build-up, periapical lysis on every root sent to my office to retreatment. The initial treatment was done more than 10 years ago by resorcinol formaldehyde technique someday in schools. Re-endo was performed 3 years ago with “modern technologies” but endo has failed as you can see. There are short and non homogenic obturation, missed MB2 that I have to fix. Cleaning shaping protocol was performed and calcium hydroxide placed for 4 weeks, usually I dress canals for two weeks but in this case a New Year Holyday has extended the exposition.