I remember having to do a bit of research on the pooularity of brands of electric toothbrushes at one point and finding that only around 1 in 60 people use one. The way my dentist tries the hard sell i’d have thought it might be much higher than that.
I don’t use one purely because i brush my teeth in the shower, so it wouldn’t be as convenient. Also sounds like you’re bunging a vibrator up your ass. I’m not saying there’s anything wrong with doing that.