[sidebar]Waterpik Ultra Water Flosser ($40; amazon.com)Multiple pressure settings and a large reservoir provide 90 seconds of continuous water flow—just enough time to clean your entire mouth. Panasonic Portable Oral Irrigator ($50; amazon.com)Even though its reservoir is small, providing just 30 seconds of water flow at a time, this irrigator is quick to refill, cordless, and supereasy to use. Waterpik Showerpik ($60; amazon.com)Our favorite attaches to your showerhead, doesn’t take up counter space, and makes it easy to multitask in the tub. Plus, no reservoir refills. More from Prevention: 25 Foods Dentists Won’t Eat