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. These replacement nozzles are designed for the Philips Sonicare Power Flosser and help to keep your teeth healthy and beautiful by removing plaque from interdental spaces and improving resistance to tartar. They make cleaning interdental spaces easier. Use according to the instructions included.