A nozzle for use on an oral irrigator device for cleaning teeth, comprising: a channel concentrically positioned within the nozzle through which a stream of liquid/air bursts are directed; a guidance tip including a base portion that is substantially circular in configuration, a tip portion, and an orifice through which the stream of liquid/air bursts exits at a flow output pattern; and a flow output pattern selection mechanism (90, 90') connected to or positioned within said guidance tip, and configured to be selectively actuated and to vary, upon said actuation: the flow output pattern between a first flow output pattern to at least a second flow output pattern, characterized in that said flow output pattern selection mechanism (90, 90') further comprises a band (92, 92') concentrically positioned around said base portion and configured to be selectively circumferentially rotatable between a first position, wherein said first flow output pattern is selected, and at least a second position, wherein said second flow output pattern is selected, and wherein said flow output pattern selection mechanism (90, 90') further comprises an outlet portion of said channel with an outlet diameter that is configured to be: decreased when said band (92, 92') is selectively circumferentially rotated from said second position to said first position, the channel being configured to be squeezed per a rotation of the band (92, 92'), the channel thereby narrowing its diameter; and increased when said band (92, 92') is selectively circumferentially rotated from said first position to said second position, a rotation of the band (92, 92') in the opposite direction releasing the pressure on the channel, and the diameter of the channel becomes larger. a channel concentrically positioned within the nozzle through which a stream of liquid/air bursts are directed; a guidance tip including a base portion that is substantially circular in configuration, a tip portion, and an orifice through which the stream of liquid/air bursts exits at a flow output pattern; and a flow output pattern selection mechanism (90, 90') connected to or positioned within said guidance tip, and configured to be selectively actuated and to vary, upon said actuation: the flow output pattern between a first flow output pattern to at least a second flow output pattern, characterized in that said flow output pattern selection mechanism (90, 90') further comprises a band (92, 92') concentrically positioned around said base portion and configured to be selectively circumferentially rotatable between a first position, wherein said first flow output pattern is selected, and at least a second position, wherein said second flow output pattern is selected, and wherein said flow output pattern selection mechanism (90, 90') further comprises an outlet portion of said channel with an outlet diameter that is configured to be: decreased when said band (92, 92') is selectively circumferentially rotated from said second position to said first position, the channel being configured to be squeezed per a rotation of the band (92, 92'), the channel thereby narrowing its diameter; and increased when said band (92, 92') is selectively circumferentially rotated from said first position to said second position, a rotation of the band (92, 92') in the opposite direction releasing the pressure on the channel, and the diameter of the channel becomes larger. the flow output pattern between a first flow output pattern to at least a second flow output pattern, characterized in that said flow output pattern selection mechanism (90, 90') further comprises a band (92, 92') concentrically positioned around said base portion and configured to be selectively circumferentially rotatable between a first position, wherein said first flow output pattern is selected, and at least a second position, wherein said second flow output pattern is selected, and wherein said flow output pattern selection mechanism (90, 90') further comprises an outlet portion of said channel with an outlet diameter that is configured to be: decreased when said band (92, 92') is selectively circumferentially rotated from said second position to said first position, the channel being configured to be squeezed per a rotation of the band (92, 92'), the channel thereby narrowing its diameter; and increased when said band (92, 92') is selectively circumferentially rotated from said first position to said second position, a rotation of the band (92, 92') in the opposite direction releasing the pressure on the channel, and the diameter of the channel becomes larger. decreased when said band (92, 92') is selectively circumferentially rotated from said second position to said first position, the channel being configured to be squeezed per a rotation of the band (92, 92'), the channel thereby narrowing its diameter; and increased when said band (92, 92') is selectively circumferentially rotated from said first position to said second position, a rotation of the band (92, 92') in the opposite direction releasing the pressure on the channel, and the diameter of the channel becomes larger.