called biofilm? biofilm germs are strong enough to survive daily brushing. thankfully there's listerine® antiseptic. its triple-action formula goes deep to penetrate biofilm, kill germs and protect your mouth for up to 12 hours. aaaahhhh... [ male announcer ] for a deeper clean fight biofilm with listerine®. you name it. i've tried it. but nothing's helped me beat my back pain. then i tried this.