Listerine original mouthwash 250ml brushing only cleans 60 of the surfaces of your teeth leaving plaque bacteria to grow in the hard to reach places in your mouth used twice a day listerine original can 1 kill germs kills up to 97 of germs left behind after brushing 2 reduce plaque reduces plaque by up to 56 more than brushing alone 3 keep breath fresh provides up to 24 hours of fresh breath protection 4 maintain healthy gums kills germs above and below the gum line to keep gum