An electric toothbrush comprising: a housing; an output shaft positioned within and extending out of the housing, the output shaft having an inlet end and an outlet end, wherein the inlet end is positioned within the housing, and the outlet end extending out of the housing; a brush head releasably coupled to the output shaft and movable therewith relative to the housing; a magnetic assembly positioned within the housing and configured to impart an oscillation motion to the output shaft; and a spring positioned within the housing, the spring including a first end non-rotatably coupled to the housing and a second end non-rotatably coupled to inlet end of the output shaft, wherein the spring twists as the magnetic assembly oscillates the output shaft to amplify the oscillation motion of the output shaft generated by the magnetic assembly; and a fluid tube routed through the first end of the spring and coupled to the inlet end of the output shaft within the spring to deliver fluid to the brush head; wherein: the magnetic assembly comprises: a first permanent magnet and a second permanent magnet attached to opposing sides of the output shaft and rotatable therewith; and a first electromagnet and a second electromagnet positioned within the housing on opposing sides of the output shaft, the first electromagnet positioned adjacent the first permanent magnet and fixed in position relative to the housing, and the second electromagnet positioned adjacent the second permanent magnet and fixed in position relative to the housing; and the output shaft is hollow and is positioned between the first permanent magnet and the second permanent magnet. a housing; an output shaft positioned within and extending out of the housing, the output shaft having an inlet end and an outlet end, wherein the inlet end is positioned within the housing, and the outlet end extending out of the housing; a brush head releasably coupled to the output shaft and movable therewith relative to the housing; a magnetic assembly positioned within the housing and configured to impart an oscillation motion to the output shaft; and a spring positioned within the housing, the spring including a first end non-rotatably coupled to the housing and a second end non-rotatably coupled to inlet end of the output shaft, wherein the spring twists as the magnetic assembly oscillates the output shaft to amplify the oscillation motion of the output shaft generated by the magnetic assembly; and a fluid tube routed through the first end of the spring and coupled to the inlet end of the output shaft within the spring to deliver fluid to the brush head; wherein: the magnetic assembly comprises: a first permanent magnet and a second permanent magnet attached to opposing sides of the output shaft and rotatable therewith; and a first electromagnet and a second electromagnet positioned within the housing on opposing sides of the output shaft, the first electromagnet positioned adjacent the first permanent magnet and fixed in position relative to the housing, and the second electromagnet positioned adjacent the second permanent magnet and fixed in position relative to the housing; and the output shaft is hollow and is positioned between the first permanent magnet and the second permanent magnet. the magnetic assembly comprises: a first permanent magnet and a second permanent magnet attached to opposing sides of the output shaft and rotatable therewith; and a first electromagnet and a second electromagnet positioned within the housing on opposing sides of the output shaft, the first electromagnet positioned adjacent the first permanent magnet and fixed in position relative to the housing, and the second electromagnet positioned adjacent the second permanent magnet and fixed in position relative to the housing; and a first permanent magnet and a second permanent magnet attached to opposing sides of the output shaft and rotatable therewith; and a first electromagnet and a second electromagnet positioned within the housing on opposing sides of the output shaft, the first electromagnet positioned adjacent the first permanent magnet and fixed in position relative to the housing, and the second electromagnet positioned adjacent the second permanent magnet and fixed in position relative to the housing; and the output shaft is hollow and is positioned between the first permanent magnet and the second permanent magnet.