Fresh Breath Chewables are a natural hard chew infused with plant-based ingredients that help balance mouth bacteria and promote oral health. Oil of oregano is an essential oil with natural antimicrobial properties. This powerful oil supports the reduction of mouth bacteria which may lead to the development of plaque. Peppermint is a refreshing, aromatic herb that has traditionally been used by humans to freshen breath. An important component of most plants, chlorophyll can help eliminate mouth odors.