Fresh Burst Antiseptic Mouthwash. Kills germs that cause bad breath, plaque and gingivitis. When used twice daily as part of regular oral hygiene, Listerine Fresh Burst helps prevent and reduce plaque, gingivitis and bad breath. Plaque is caused by germs in the mouth. Plaque build up may lead to gingivitis, an early form of gum disease. The symptoms of gingivitis are redness, swelling and bleeding gums. Gum disease is a major cause of tooth loss.