Mouthwash, also known as oral rinse or mouth rinse, is a liquid oral hygiene product used to rinse the mouth, freshen breath, and reduce oral bacteria. Mouthwash may contain antiseptic ingredients such as chlorhexidine or essential oils to kill bacteria, as well as fluoride to strengthen enamel and prevent tooth decay. Some mouthwashes also contain ingredients to reduce plaque buildup, soothe irritated gums, or whiten teeth. Mouthwash can be used as a complement to brushing and flossing to enhance oral hygiene and promote overall mouth health.