How Olive Leaf Mouthwash works: Nature’s Goodness Olive Leaf Extract Mouthwash is a naturally-based formula which will freshen your breath and help fight plaque and tooth decay. Use daily in conjunction with brushing and flossing as part of your oral care routine. Nature’s Goodness Olive Leaf Extract Mouthwash is alcohol-free, paraben-free, SLS-free, and contains no artificial colours, flavours or sweeteners. Olive Leaf Extract - contains anti-bacterial compounds such as oleuropein to help fight the bacteria which cause bad breath and tooth decay. Xylitol - inhibits plaque formation and tooth decay, by preventing the proliferation of bacteria in the mouth. Lemon and Peppermint Oil - essential oils which neutralize odours and freshen breath.Decyl glucoside - a mild naturally-derived (from corn starch and coconut oil) surfactant.