Bristle driven pulsation

An electric toothbrush comprising:

• a brush head having a longitudinal axis and including a plurality of bristles attached to the brush head at a non-perpendicular angle with respect to the brush head;
• and
• a handle removably attached to the brush head and including:
• a linear motor configured to rotatably drive the plurality of bristles attached to the brush head clockwise and counterclockwise with respect to the brush head at a rotation frequency which is at or above a frequency threshold, wherein the brush head moves toward and away from a contact surface caused solely by bristle driven pulsation,
• wherein the bristle driven pulsation is caused, at least in part, by the non-perpendicular angle at which the bristles are attached to the brush head,
• a gearing structure coupled to the linear motor, wherein the gearing structure is driven by the linear motor and configured to transform a linear movement of the linear motor into rotation of the plurality of bristles, and
• wherein the brush head vibrates in a direction substantially perpendicular to the longitudinal axis and at one or more vibration frequencies corresponding to the rotation frequency.

An electric toothbrush comprising:

• a brush head having a longitudinal axis and including a plurality of bristles attached to the brush head at a non-perpendicular angle with respect to the brush head;
• a brush neck attached to the brush head;
• and
• an electric toothbrush handle removably attached to the brush neck and including:
• a linear motor configured to drive the plurality of bristles attached to the brush head to rotate clockwise and counterclockwise by a predetermined angle of rotation with respect to the brush head at a rotation frequency greater than 100 Hz,
• wherein an amount of rotation of the plurality of bristles remains substantially the same as a load applied to a contact surface increases,
• wherein, due solely to bristle driven pulsation, wherein the bristle driven pulsation is due at least in part to the bristles being attached to the brush head at the non-perpendicular angle with respect to the brush head, the brush head moves toward and away from a contact surface in a direction substantially perpendicular to the longitudinal axis and in synchronization with the rotation of the plurality of bristles by vibrating at at least one vibration frequency corresponding to the rotation frequency, and
• wherein the at least one vibration frequency includes a predetermined rotation frequency or multiples of the predetermined rotation frequency, and
• wherein the handle includes a gearing mechanism coupled to and driven by the linear motor to transform movement of the linear motor into rotation of the plurality of bristles.