GoKawiilWhy we like it: The Waterpik Ion is the best water flosser overall for multiple reasons. As a countertop water flosser, it has a more compact profile (7.60 x 6.20 x 6.10 inches) than the two other countertop models tested: the Waterpik Aquarius and the AquaSonic Aqua Flosser Professional. According to the company, it's 30% smaller in size than traditional plug-in models. The Ion is also tied with the Aquarius for the largest water tank at 651ml, which gives you 90 seconds of water capacity, so you don't have to refill it as often during use. Plus, the tank is easy to separate from the device for cleaning.
Compared to the Aquarius, the Ion is $10 cheaper at $90, and it comes with one of the longest warranties on this list: a three-year limited warranty.
The Ion offers 10 pressure levels and six tips (implant denture, two precision, orthodontic, Pik Pocket and Plaque Seeker), each of which can rotate 360 degrees, making it a great option for braces, dentures, implants and getting around teeth. It has a 1-minute timer, an easy-to-use on/off switch and a magnetic handle cradle, which is fun to use. It's also the only countertop water flosser on this list that can be unplugged, thanks to its 28-day battery life.
Most importantly, it has the American Dental Association Seal of Acceptance.
Who it's best for: The Waterpik Ion is best for anyone who wants a compact countertop water flosser with a large water tank. It's also great for anyone with braces, implants or dentures, thanks to the different tips and 360-degree rotation.
Who shouldn't buy it: While the Ion offers great value for under $100, its $90 full price is still on the high side. Also, if you're looking for an even more compact flosser, especially for travel, you might want to opt for a portable, cordless model.