The device (1) has a powder container (2a) with an inlet for pressurized gas and where the powder container is connected with a discharge nozzle (6) at which a powder gas mixture and water are discharged under pressure. A receiving area is provided with a mixture attachment and a gas attachment. The powder container has a coupling area for replaceable connection of the powder container with the powder jet device. An independent claim is also included for a method for dental treatment.