A dental cleaning device for simultaneously brushing at a plurality of dental positions, comprising: - a mouthpiece having a pressure chamber and a recess which is U-shaped in cross section and delimited by a flexible and/or deformable recess wall , the pressure chamber being configured for containing a fluid under pressure, - a plurality of bristles , each attached to the recess wall with one end thereof and extending from said recess wall into the recess; - a pump unit arranged in fluid communication with said pressure chamber , the pump unit being configured to reciprocatingly increase and decrease a pressure in the pressure chamber between an increased pressure condition and a decreased pressure condition by pumping a volume of fluid into, respectively out of, the pressure chamber , thereby deforming the recess wall and moving the recess wall back and forth increasing respectively decreasing the recess , characterised, in that the dental cleaning device further comprises: - a pressure sensor configured to measure a pressure representative of the pressure in the pressure chamber and to produce a pressure signal representative of said pressure, and - a controller configured to generate a control signal; wherein the pressure sensor and the controller are connected such that the controller , in use, receives the pressure signal from the pressure sensor and the controller and pump unit are connected such that the pump unit , in use, receives the control signal from the controller ; wherein the controller is configured to generate the control signal in dependence on the pressure signal and the pump unit is configured to provide a delivery into and/or out of the pressure chamber in response to the control signal; and wherein the controller is configured to reduce the delivery of the pump unit when the pressure in the pressure chamber exceeds a predetermined upper threshold. - a mouthpiece having a pressure chamber and a recess which is U-shaped in cross section and delimited by a flexible and/or deformable recess wall , the pressure chamber being configured for containing a fluid under pressure, - a plurality of bristles , each attached to the recess wall with one end thereof and extending from said recess wall into the recess; - a pump unit arranged in fluid communication with said pressure chamber , the pump unit being configured to reciprocatingly increase and decrease a pressure in the pressure chamber between an increased pressure condition and a decreased pressure condition by pumping a volume of fluid into, respectively out of, the pressure chamber , thereby deforming the recess wall and moving the recess wall back and forth increasing respectively decreasing the recess , characterised, in that the dental cleaning device further comprises: - a pressure sensor configured to measure a pressure representative of the pressure in the pressure chamber and to produce a pressure signal representative of said pressure, and - a controller configured to generate a control signal; - a pressure sensor configured to measure a pressure representative of the pressure in the pressure chamber and to produce a pressure signal representative of said pressure, and - a controller configured to generate a control signal; wherein the pressure sensor and the controller are connected such that the controller , in use, receives the pressure signal from the pressure sensor and the controller and pump unit are connected such that the pump unit , in use, receives the control signal from the controller ; wherein the controller is configured to generate the control signal in dependence on the pressure signal and the pump unit is configured to provide a delivery into and/or out of the pressure chamber in response to the control signal; and wherein the controller is configured to reduce the delivery of the pump unit when the pressure in the pressure chamber exceeds a predetermined upper threshold. <EOS>