Abstract: A dental apparatus for irrigating root canals of teeth comprises a device (1) with an elongated flexible feeder (12) or a flexible pipe introducing a cleansing and/or medical fluid into the root canals of teeth. The device (1) introducing the cleansing and/or medical fluid is moveably inserted in a chamber (5) formed in a head (4) having an angled narrowing (6) with a bush-shaped ending (8) fitted with a duct (13) and connected with the chamber (5) and used to insert the elongated flexible feeder (12). The head (4) is provided with a suction duct (9) connected to the duct (13) near its outlet and carrying at vacuum the cleansing and/or medical fluid flowing out from the root canal to outside of an oral cavity.