An oral irrigator is provided that has a pump unit having at least a first pump being connected or being connectable to at least a first fluid reservoir containing a first fluid, a control unit for controlling the pump unit, at least a first outlet nozzle for emitting fluid pumped from the first fluid reservoir to the first outlet nozzle during operation as a continuous or pulsating fluid jet, wherein the control unit is arranged to control the pump unit during operation in at least a first operation mode such that at least a first fluid jet parameter of the continuous or pulsating jet is automatically varied over time.
