Speed: 1. Fill the 300ML water tank with warm water. 2. Choose the desired cleaning mode on the smart LCD screen. 3. Attach the appropriate nozzle for the user. 4. Lean over the sink and aim the nozzle at the gum line. 5. Press the power button and move the nozzle along the gum line and between teeth. 6. After use, clean the nozzle and water tank, and allow the device to fully charge.