Speed: 1. Fill the 320 ml water tank with warm water. 2. Select the desired cleaning mode and water pressure. 3. Place the tip in your mouth and lean over the sink. 4. Turn on the device and close your lips to form a tight seal. 5. Direct the water stream at a 90-degree angle to your gumline, moving slowly and systematically around your mouth. 6. After use, remove the tip and rinse it under clean water. 7. Clean the water tank and any other removable parts with mild soap and warm water. 8. Allow all parts to air dry completely before storing. 9. Replace the tip every 3-6 months or as needed. 10. Charge the device for 3 hours after each use or when the battery indicator shows low power.