The unique imploding action which is caused by the ultrasound destroys the particles and breaks up the membranes of bacteria and germs the ultrasound implodes millions of bubbles every millisecond while at the same time creating new ones this continuous cycle goes on while the ultrasound is transmitted from the brush head actual brushing like with other toothbrushes is not necessary thats what makes emmi dent so gentle and sensitive to your gums emmi dent is a no brushing toothbrush