Ozone Water Oral Irrigator with multipurpose mouthwash A water flosser, also known as an oral irrigator, is a handheld oral care device that uses a stream of water to remove food debris, plaque, and bacteria from between your teeth and gums. A water flosser, when used in conjunction with daily flossing, improves your oral care routine. There are many different kinds of oral irrigators, but they all have a reservoir to hold the water, an electric motor to power the pump, and a special nozzle. To remove plaque, food particles, and bacteria, the motor and pump force a stream of pressurised water from the reservoir, through the nozzle, and between teeth.