My periodontist has always suggested using an electric toothbrush. I have been using a Braun Oral B for years. It is the type that recharges its batteries when you put it back on its stand.
Things went fine for many years. I even remembered to change the brush occasionally, but I am sure it was way later than recommended. Then the proverbial sh*t hit the fan! The damn think would not turn OFF! I found that it would turn off if you put it back on its charger. Otherwise it ran all the time.
The greatest challenge was to put the toothpaste onto the brush. You know “the hitting the moving object challenge”. But, as I am an engineer, and know about centrifugal force this task was somewhat easily mastered. So the only inconvenience was after I rinsed off the brush and went to put it back onto its stand. Centrifugal force was still at work, flinging little drops of water all over the place, including the bottom of the mirror. This brought unkind comments from my significant other. I do not even want to know what the cleaning person thought.
So I broke down and went to StuffMart. For about $20 I got a new brush. Peace once again reigns in our household. I still wonder if that brush is still running in the trash can, as it was running when I threw it in there. If you are at landfill and hear a toothbrush running, you will know it is mine.