An oral irrigator (100, 200 300, 400, 500) comprising: an irrigator tip (103, 203, 303, 403, 503), the irrigator tip comprising: a handle portion (106, 206, 306, 406, 506); a tip portion (109, 209, 309, 409, 509); a channel (112, 212, 312, 412, 512) in fluid communication with the handle portion and the tip portion; and, an actuator (115, 215, 315, 415, 515), the actuator located on or within the handle portion, the actuator arranged to at least partially alter a flow (142, 242, 342, 442, 542) of a fluid (145, 245, 345, 445, 545) through the channel; a housing (148, 248, 348, 448, 548), the housing having a reservoir (151, 251, 351, 451, 551) containing the fluid, the reservoir in fluid communication with a pump sub-assembly (154, 254, 354, 454, 554); a pressure sensor (157, 257) arranged to measure a first pressure (160A, 260A); and, a control unit (172, 272, 372, 472, 572) arranged to control an operational current (181, 281, 381, 481, 581) provided to the pump sub-assembly or arranged to control a control valve of the pump-sub assembly; and, a tether (184, 284, 384, 484, 584) having a first end (187, 287, 387, 487, 587) and a second end (190, 290, 390, 490, 590), the first end of the tether in fluid communication with the irrigator tip and the second end of the tether in fluid communication with the pump sub-assembly; wherein, operation of the actuator produces a second pressure (160B, 260B) measured by the sensor, and the control unit is arranged to alter the operational current or at least partially alter the flow via the control valve in response to a change from the first pressure to the second pressure. an irrigator tip (103, 203, 303, 403, 503), the irrigator tip comprising: a handle portion (106, 206, 306, 406, 506); a tip portion (109, 209, 309, 409, 509); a channel (112, 212, 312, 412, 512) in fluid communication with the handle portion and the tip portion; and, an actuator (115, 215, 315, 415, 515), the actuator located on or within the handle portion, the actuator arranged to at least partially alter a flow (142, 242, 342, 442, 542) of a fluid (145, 245, 345, 445, 545) through the channel; a handle portion (106, 206, 306, 406, 506); a tip portion (109, 209, 309, 409, 509); a channel (112, 212, 312, 412, 512) in fluid communication with the handle portion and the tip portion; and, an actuator (115, 215, 315, 415, 515), the actuator located on or within the handle portion, the actuator arranged to at least partially alter a flow (142, 242, 342, 442, 542) of a fluid (145, 245, 345, 445, 545) through the channel; a housing (148, 248, 348, 448, 548), the housing having a reservoir (151, 251, 351, 451, 551) containing the fluid, the reservoir in fluid communication with a pump sub-assembly (154, 254, 354, 454, 554); a pressure sensor (157, 257) arranged to measure a first pressure (160A, 260A); and, a control unit (172, 272, 372, 472, 572) arranged to control an operational current (181, 281, 381, 481, 581) provided to the pump sub-assembly or arranged to control a control valve of the pump-sub assembly; and, a tether (184, 284, 384, 484, 584) having a first end (187, 287, 387, 487, 587) and a second end (190, 290, 390, 490, 590), the first end of the tether in fluid communication with the irrigator tip and the second end of the tether in fluid communication with the pump sub-assembly; wherein, operation of the actuator produces a second pressure (160B, 260B) measured by the sensor, and the control unit is arranged to alter the operational current or at least partially alter the flow via the control valve in response to a change from the first pressure to the second pressure.