Listerine coolmint mouthwash 500ml 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 coolmint is proven to 1 kills up to 97 of germs left behind after brushing 2 reduce plaque by up to 56 more than brushing alone 3 provide fresh breath protection for up to 24 hours 4 maintains healthy gums by killing germs above and below the gum line to keep gums healthy