For maximum coverage and an extra thorough clean, use the Quad Stream nozzle to concentrate water into four wide streams between teeth and along the gum line.For maximum coverage and an extra thorough clean, use the Quad Stream nozzle to concentrate water into four wide streams between teeth and along the gum line. The soft rubber guide is gentle on gums and every nozzle simply clicks on and off Always get an effective clean between teeth and along the gum line The Quad stream nozzle concentrates water into four wide stream to clean between teeth and along the gum line For the most effective clean, Philips