to engage the user 39 s teeth upon use of the electric toothbrush 26 a brush shaft housing 104 generally having an elongated tubular shape and defining an aperture 106 108 at an upper end 110 and at a lower end 112 and also defining an elongated internal cavity 113 fits loosely over the brush shaft 100 the brush head 28 has a downwardly depending longitudinal extension 114 that inserts through the aperture 106 at the upper end 110 of the brush shaft housing 104 and into a cavity 116 at the upper end 98 of the brush shaft 100 the extension 114 is rigidly attached to the brush shaft 100 a shoulder 120 proximate to the extension 114 abuts the upper end 110 of the brush shaft housing 104 the brush head 28 and brush shaft 100 in this configuration are able to rotate in conjunction freely with respect to the brush shaft housing 104 to allow the brush head assembly 34 to be replaced the brush head assembly is releasably operably attached to an upper end 122 of the handle housing an upper end 124 of the drive shaft 40 is splined and extends through the aperture 49 in the upper.