Actuation assembly for an oral irrigator

An oral irrigator comprising:

• a reservoir;
• a handle in fluid communication with the reservoir;
• a housing supporting the reservoir;
• a pump received within the housing and configured to pump fluid from the reservoir to the handle;
• a power assembly configured to selectively activate and deactivate the pump;
• a pressure assembly configured to selectively adjust a fluid pressure of fluid delivered to the handle from the pump;
• and
• an actuator assembly comprising:
• a bezel comprising a first portion positioned within and secured to the housing and a second portion positioned outside of the housing;
• an actuator operably coupled to the housing and movable relative to the housing the bezel, the actuator comprising:
• a body;
• a face defined at an end of the body, the face comprising an interior surface facing towards the housing and an exterior surface facing away from the housing;
• a shaft extending from the interior surface of the face along a central axis thereof, wherein manipulation of the body causes the shaft to move a component of the power assembly or the pressure assembly;
• and
• an augmentation fluid positioned between a portion of the bezel and a portion of the actuator, wherein the augmentation fluid modifies a frictional relationship between the bezel and the actuator to provide a predefined resistance force between the actuator and the bezel as the actuator is rotated relative to the bezel.