Benefits Contains fluoride for a deeper whole mouth clean than brushing alone. Protects against cavities. Helps prevent and reduce plaque Kills germs left behind after brushing & flossing. Provides long lasting fresh breath. Maintains healthy gums. For stronger teeth & a healthier mouth than brushing alone. Ever wondered why you need to incorporate a fluoride mouthwash as part of your oral care routine? Brushing and flossing alone only reaches 25% of your mouth. Incorporating a Listerine fluoride mouthwash as your third step helps to kill germs in the remaining 75% of the mouth and can help reduce plaque to help provide that long-lasting fresh breath.