An oral irrigation device including a reservoir, a tip, and a pump. The pump is operative to draw fluid from the reservoir and propel the fluid to the tip. The pump includes a pump body fluidly connected to the reservoir and the tip, the pump body having an interior wall defining a pump chamber, the pump chamber terminating in an open end and a force exerting assembly that is receive within the pump chamber. The force exerting assembly is movable between a first position and a second position and includes a force exerting member and a compressible sealing member received around the force exerting member. The sealing member engages the interior wall of the pump body during movement from the first position to the second position and movement from the second position to the first position to prevent fluids from escaping the open end of the pump body.