I want to add to my list the electric toothbrush!
My dentist talked me into it, but honestly, it's a pain to use. He insisted on a certain model, it's supposed to be top of the line, but there's no pause button. It runs for two minutes, and during that time, no chance to spit and rinse, or even inhale through your mouth.
Even to move the toothbrush to another part of your mouth, your lips have to be closed or it sprays toothpaste all over your face and hair.
I don't think it does much more for me than regular brushing and flossing. Maybe a little more, but not enough to endure the discomfort.