Looks like the original version is driven by a coil electromagnet which deflects rare earth magnets in the brush head. https://www.powerelectronictips.com/teard

Looks like the original version is driven by a coil electromagnet which deflects rare earth magnets in the brush head. https://www.powerelectronictips.com/teardown-whats-inside-a-phillips-sonicare-electric-toothbrush/ https://www.powerelectronictips.com/teardown-whats-inside-a-...