For a sonic toothbrush - an existing, well-established product - we are developing the concept for a comprehensive revision of the system in this project. Through the development of a holistic mechatronic design, the product functionality is extended and production aspects are improved. All individual components are redesigned and optimised for production at the home location in Switzerland. In addition, various smart features are developed and implemented in close collaboration with the industrial partner. Feasibility will be confirmed with successful static and cyclic load tests.