COOL MINT LISTERINE Mouthwash gives you 24-hour protection against plaque, bad breath and gum problems. A 30-second rinse with COOL MINT LISTERINE Mouthwash during your morning and night-time routines is all it takes to get 24-hour protection against germs that cause plaque and gum problems. WARNING: For external use only. Not to be swallowed. Keep out of reach of children. Not recommended for children below 12 years of age.