Dental cleaning device

A dental cleaning device for simultaneously brushing at a plurality of dental positions, the dental cleaning device comprising:

• a mouthpiece having a pressure chamber and a recess delimited by a recess wall, the recess wall having a curved length direction and a U-shaped cross-section transverse to the length direction, the recess wall being configured for encompassing, viewed in the curved length direction, the recess wall extending from a first end to a second end opposite the first end, and the pressure chamber being configured for containing a fluid under pressure;
• 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 and out of the pressure chamber, thereby deforming the recess wall and moving the recess wall back and forth, said pump unit, in operation, operating at a predetermined operating frequency;
• and
• wherein the predetermined operating frequency is in the range of 0.5 to 20 Hz.

A method of operating a dental cleaning device for simultaneously brushing at a plurality of dental positions, comprising:

• providing a cleaning device that comprises:
• a mouthpiece having a pressure chamber and a recess delimited by a recess wall, the recess wall having a curved length direction and a U-shaped cross-section transverse to the length direction, the recess wall being configured for encompassing, viewed in the curved length direction, at least a part of a dental arch of a user, and the pressure chamber being configured for containing a fluid under pressure;
• 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 and out of the pressure chamber, thereby deforming the recess wall and moving the recess wall back and forth;
• and
• reducing a delivery of the pump unit is reduced when the pressure in the pressure chamber exceeds a predetermined upper threshold;
• and
• wherein the pump unit is configured to operate at an operating frequency in the range of 0.5 to 20 Hz.