Not sure if this is 100% scientifically backed but I read a bit by a dental hygienist on a forum that you shouldn’t rinse when brushing with proper toothpaste because it can help remineralize the teeth if when its not rinsed away after
Its annoying but its a good way to cut down on mindless snacking at the very least for me so its something I do sometimes. Hope its not voodoo
On electric toothbrushes, my hygienist basically told me: Imagine how many times you go back and forth manually with your hand when brushing. Now compare that to how many times an electric toothbrush can do the same in the same time frame. So the latter is more effective.