Charging problems. Poor design.
Poorly made charging connection. The device supposedly sits freely with electrodes touching other electrodes in the base.  Getting them to touch just right is tricky to say the least!  Also, since it IS a toothbrush it’s not uncommon for it to be a bit damp when you set it down. Since it sits upright in the base ant moisture runs down into the base and the electrodes just sit in it and corrode, making charging even more difficult.  AND the device needs charging far more frequently than advertised. All in all a very unsatisfactory purchase.
Rating: 1 stars