Brush head for electric toothbrush

A brush head for an electric toothbrush, the brush head comprising:

• a hollow body part having a first end and a second end;
• a back and forth rotating actuating shaft inside the body part;
• a cylindrical pin proximate an end of the actuating shaft, the cylindrical pin is coaxial in relation to the longitudinal rotation axis of the actuating shaft;
• a hole near the second end of the body part, wherein the pin is received in the hole;
• and the body part having a rotating bristle carrier rotated back and forth by the actuating shaft at the second end of the body part,
• wherein the end of the actuating shaft comprises a protrusion that is in an inclined angle (A) in relation to the rotation axis of the actuating shaft,
• wherein the bristle carrier comprises a groove that is substantially straight and parallel to the rotation axis of the bristle carrier, and when the bristle carrier is in its middle position, the groove is open substantially towards the end of the actuating shaft, and the protrusion is inside the groove so that when the actuating shaft is making its back and forth rotation motion around its rotation axis, the protrusion in the groove turns and rotates simultaneously the bristle carrier back and forth, wherein the inclination angle (A) of the protrusion is between 20-70 degrees, and the protrusion is directed to extend towards the rotation axis of the actuating shaft, and that the pin and the inclined protrusion form a combination where the protrusion is extending towards the rotation axis of the actuating shaft and towards the pin.