Electric Toothbrush

An electric toothbrush having a central longitudinal axis and comprising:

• an elongated tubular body defining a handle having a hollow cavity formed therein, wherein a battery powered motor and a battery are disposed inside said hollow cavity;
• wherein the motor includes an axially rotating motor drive shaft and a gear train having two spur gears of differing diameter, wherein a smaller spur gear of the two spur gears is attached to a motor output drive shaft and operatively connected to a bigger spur gear, and wherein the bigger spur gear is attached to a front end of a handle portion of a central drive shaft;
• a brush head having a bristle roll drive shaft with a plurality of bristle tufts radially and outwardly disposed thereon, thereby forming a bristle roll;
• a neck extending between the handle and the brush head;
• wherein the handle portion of the central drive shaft is operatively connected to a neck portion of the central drive shaft by a core jaw coupling and a cavity jaw coupling;
• wherein the neck portion of the central drive shaft is longitudinally disposed along the central longitudinal axis of the neck and is operatively connected to the bristle roll drive shaft at the brush head;
• wherein the bristle roll drive shaft and the central drive shaft are operatively connected by a belt and pulley system comprising two pulleys of differing diameter and a belt, wherein the belt and pulley system is arranged such that the bristle roll drive shaft is offset from and parallel to the central drive shaft in an eccentric-in-line position;
• and
• wherein the central drive shaft causes a one-way forward rotating motion of the bristle roll through the belt and pulley system.