This water flosser is amazing. I had a portable one previously but it only held 100ML of water. This Keenstone one holds 300ML of water so I only need to fill it up once when flossing. I love how powerful it is. At first it felt a bit too powerful so I put it on the Soft mode which made it feel better until my gums strengthened up. It’s amazing how much food the Water Flosser gets out even after I brush my teeth. This Water Flosser works much better than just string floss. I’m really pleased with this purchase.