Periodontal cleaning device , comprising: - a cleaning head having a fluid outlet for releasing a cleaning fluid and a suction member , made of soft, resilient material, for suction of a waste fluid, wherein the cleaning head is configured to be applied to periodontal areas of a subjects mouth, more specifically on the crevices between the teeth and the gums onto pockets that require cleaning; - a cleaning fluid source , connected to the fluid outlet via a fluid feed line ; - a controllable suction means connected to the suction member via a suction line ; - controllable fluid feeding means for controlling a flow of the cleaning fluid from the cleaning fluid source to the fluid outlet ; - a control unit , the control unit being arranged for - controlling the controllable suction means in generating a vacuum pulse (I) in the suction member ; - controlling the controllable fluid feeding means in generating a cleaning fluid flow pulse (II) in the fluid outlet in response to the vacuum pulse (I), and - controlling the controllable suction means in generating a subsequent vacuum pulse (I) in the suction member ; - wherein the fluid outlet for releasing a cleaning fluid is coaxially centered within the suction member characterized by - the control unit being arranged for pausing a predetermined time period (td 4 ) between the generating the cleaning fluid flow pulse (II) in the fluid outlet and the generating the subsequent vacuum pulse (I) in the suction member ; - wherein the suction member has a suction cup , an inward curved collar and a passage for sucked in air and/or waste fluid; and - wherein the suction member is formed such that the cup is formed around the fluid outlet . - a cleaning head having a fluid outlet for releasing a cleaning fluid and a suction member , made of soft, resilient material, for suction of a waste fluid, wherein the cleaning head is configured to be applied to periodontal areas of a subjects mouth, more specifically on the crevices between the teeth and the gums onto pockets that require cleaning; - a cleaning fluid source , connected to the fluid outlet via a fluid feed line ; - a controllable suction means connected to the suction member via a suction line ; - controllable fluid feeding means for controlling a flow of the cleaning fluid from the cleaning fluid source to the fluid outlet ; - a control unit , the control unit being arranged for - controlling the controllable suction means in generating a vacuum pulse (I) in the suction member ; - controlling the controllable fluid feeding means in generating a cleaning fluid flow pulse (II) in the fluid outlet in response to the vacuum pulse (I), and - controlling the controllable suction means in generating a subsequent vacuum pulse (I) in the suction member ; - controlling the controllable suction means in generating a vacuum pulse (I) in the suction member ; - controlling the controllable fluid feeding means in generating a cleaning fluid flow pulse (II) in the fluid outlet in response to the vacuum pulse (I), and - controlling the controllable suction means in generating a subsequent vacuum pulse (I) in the suction member ; - wherein the fluid outlet for releasing a cleaning fluid is coaxially centered within the suction member characterized by - the control unit being arranged for pausing a predetermined time period (td 4 ) between the generating the cleaning fluid flow pulse (II) in the fluid outlet and the generating the subsequent vacuum pulse (I) in the suction member ; - wherein the suction member has a suction cup , an inward curved collar and a passage for sucked in air and/or waste fluid; and - wherein the suction member is formed such that the cup is formed around the fluid outlet . <EOS>