Patent ID: 8800089

Claim:
A device comprising a. an air-water jet device configured to clean a dental surface comprising a first nozzle and a second nozzle; wherein: i. the first nozzle is in fluid communication with a feed liquid source; ii. the second nozzle is connected to a source of compressed air; and iii. both nozzles are positioned relative to a central axis, wherein the first nozzle is at an angle of between 1 and 60° relative to the central axis; wherein the second nozzle is at an angle of between 1 and 45° relative to the central axis; and wherein the central axis is normal to the dental surface; wherein a mouth of the second nozzle is positioned more forward in the direction of the flow along the direction of the central axis than a mouth of the first nozzle, wherein the offset distance between the mouth of the first nozzle and the second nozzle is between 0.5 and 5 mm in said direction; wherein the first nozzle and the second nozzle are positioned so as to result in: (i) mixing of the air and the feed liquid at the mouth of the second nozzle when the device is in operation and (ii) liquid from the first nozzle forming a film around the second nozzle when the device is in operation; wherein the second nozzle does not co-axially surround the first nozzle; wherein the distance between an opening of the first nozzle and a side of the second nozzle is less than 2 mm; and wherein the device further comprises a handle and a head, wherein the head further comprising bristles, and wherein the bristle-head is configured to be electrically operated.