What does FreshBurst Listerine Mouthwash do? FreshBurst Listerine Mouthwash helps fight mild infections of the mouth and throat and associated bad breath. They kill germs that cause plaque, bad breath and gum disease (gingivitis) to give you a cleaner, healthier mouth. 2. How should FreshBurst Listerine Mouthwash be used? Brush twice every day. After each brushing session, use 20 ml (approximately 3/4 capful) to rinse your teeth and gums. Gargle for 30 seconds. Do not swallow. Do not dilute. 3. How would you describe Freshburst Listerine Mouthwash and Coolmint Listerine Mouthwash? Kindly note that we do not give any medical advice. TAKEALOT.com is a retail website, selling supplements and other health-related branded products (none of which are scheduled medication). Any medical advice should be given by your personal health care professional.