Passive ultrasonic irrigation (PUI) files of different lengths and diameters, Irrisafe™ files adapt to many sizes of canal:Ø 20 length 21mm and 25mmØ 25 length 21mm and 25mmIrrisafe™ files are used for irrigation once the root canal has been prepared.20ml of irrigant (NaOCl) are injected into the canal. Irrisafe™ is inserted 2mm short of the working length and activated by performing withdrawal movements to flush the debris and the smear layer upwards. Repeated 3x 1 minute in each canal.