A flossing device cleans inside a mouth and essentially uses a water jet rather like a string of dental floss, to accomplish removal of particles between teeth. The device includes a mouthpiece that fits over the teeth. Advantageously no suction pump, nor power source, is included or needed in the device, which can be attached to a standard faucet. The device receives water from a standard faucet, which water exits the device from multiple holes in the mouthpiece.