Periodontal pockets are areas where plaque buildup has irritated the surrounding gums enough to make them pull away from the teeth, leaving gaps that can be ground zero for bacterial growth, additional plaque development, infections and bone loss. Even if you've been treated for gum disease, pockets can still persist, making it harder to keep gum problems under control. Water flossers are effective at getting pulsing water jets down deep into periodontal pockets to remove bacteria and developing plaque where a toothbrush and even a string flosser can't reach. Pocket cleaning tips are designed to irrigate up to 90 percent of even deep periodontal pockets. This specialty tip is designed to clean only periodontal pockets on the lowest power setting. It's not considered a general cleaning tool.