How to use: Use the Listerine mouthwash twice daily, morning and evening after brushing. Pour 20ml (4 x 5ml teaspoons) into a glass, rinse for 30 seconds, then spit out. ✔ Modern Design. To treat gingivitis: Bleeding gums can be a sign of gingivitis, an inflammation of the gums caused by plaque bacteria sticking to your gums.
