Speed: 1. Fill the 300ml water tank with warm water. 2. Choose one of the 4 cleaning modes and adjust the water pressure using the pressure control button. 3. Place the tip of the irrigator in your mouth, pointing at a 90-degree angle to your teeth. 4. Turn on the device and move the tip along your gum line and teeth. 5. After use, remove the tip and rinse it under clean water. 6. Clean the water tank and allow all parts to dry before storing. 7. Always follow the safety warnings provided.