I was listening to one local station’s version of Weenie and the Butt and the subject came up about using your non-dominant hand to brush your teeth, as a brain stimulator (not literally). Most of the folks in the wacky morning show said they already switch hands during brushing. This came as a 
to the woman who brought up the idea and to me, as we both use only our dominant hand to brush.
So, you?
Dominant hand for both sides. Until this thread, I literally never thought of doing otherwise, or that anyone else ever did.
Dominant for both sides, though since I got an electronic brush, I occasionally multi-task and switch hands in that case. It’s really not often, though. And when using a manual brush, I have to only use my dominant hand, switching is too awkward.
I am mostly right-handed and use my right hand to brush both sides of my mouth. It never occurred to me to do otherwise. Modern angled toothbrushes let you reach everywhere you need to easily with either hand. However, I am mildly ambidextrous. I eat the European way with a fork in my left hand and knife in the right and never switch even for meals that do not need a knife. I also sweep and mop in a left-handed fashion but I can’t write very well that way and I can’t throw very well at all with my left-hand. Other tasks are mixed as to which hand I prefer. I never thought about any of the tasks or was forced to do them in a particular way. It is just the way it works best for me. I suspect that people that do any switching hands strategy for most anything were purposely taught to do it that way even though it is usually for dumb reasons.
Sometimes I use only my dominant hand, but usually I use my dominant hand on my non-dominate side and my non-dominate hand on my dominate side. It just makes it easier to really scrub the sides and bottoms of the back molars. Plus, I also heard about using your non-dominant hand to increase motor skills on that side, and it’s always been a weird dream of mine to be ambidextrous.
I had to try it to find out. 
I just used the dominant hand on both sides, but then, without thinking about it, I used the non-dominant hand to hold the waterpik. I think that’s because the machine is on that side, and it’s easier if I don’t have to pull the cord across me.
But I’m kinda ambidextrous.
I write with my right hand, and that’s it. If I tried to brush my teeth with my right hand, I’d end up gouging divots out of my gums and quite possibly piercing my brain with the toothbrush.
I also throw with my left hand properly; can’t throw to save my life right handed.
I had to buy a left-handed spinning wheel for my textile hobbies.
My mother is completely and utterly left handed, so that may be why.
On the other hand (heh) if I stick a pencil in my left hand, I can feel my brain cramping up; can’t get it to work at all (I can write backwards cursive fairly quickly with my right hand, though).
Just dominant. I roll the brush over to keep from it becoming awkward.
The only time I’ve used my other hand is when brushing my tongue and my mouth kept cramping up. I switched to the other hand to see if the different angle would help. I don’t remember if it worked.
Right now, I’m the only freak who switches hands to match the side I’m brushing. Hmmm.
Right. I had to use the left a few times when I’d injured my right (dominant) hand and it was very awkward; I could never get the toothbrush at the correct angle and kept poking the insides of my cheeks or smacking the roof of my mouth.
That’s why this bit on the radio struck me. The woman who brought it up only used her dominant hand, but the three men in the room all switched and didn’t know what she was talking about. You are not alone!
Right hand brushes the left side, switch, and the left hand brushes the right side. That just seems like the natural way the business end of the brush is pointed. But I am a bit ambidextrous, except for hand writing.
My wife and I are both right handed but she is a bit of a sports nut and learned at an early age to bat left handed playing baseball and softball. It throws the pitchers off and you gain an advantage. She also golfs left handed and has a left handed set of clubs. I had never played golf until I met her so I learned on her left handed set of clubs and I am not sure I could even play at all now if you gave me a right handed set of clubs.
I am left-handed and do just about everything with my left hand, including brushing my teeth.
The only thing I can do well, or at all, with my right hand, is throw a ball. I used to pitch softball and baseball, both under- and over-hand in high school and was pretty good, if I say so myself, but only right-handed.
Put a toothbrush in my right hand, however, and I may not leave the bathroom alive.
I want Skald to bake me a cake.
My right hand.