I have heard one hundred times that I must not run the water while I brush my teeth. But my tooth brushing technique involves constant rinsing so that I always have a cold, fresh toothbrush to work with. And the cold tap is on my right, and I brush right handed, so there is really no way my left hand can help at all. I have sincerely tried to brush my teeth with the water off and I hate it. I try to pretend I am camping, but I am not camping. I have tried using a cup of water, but they don't get clean so I just have to brush them over using running water.