Waterpik Sonic-Fusion Flossing Electric Toothbrush Water Flosser, White

Why it's worth it

The Sonic-Fusion combines a sonic electric toothbrush and a water flosser into a single handle, with water running through the brush head as you brush. It's the most expensive thing here and the only device that lets you do both jobs in one pass.

The pitch is simple: one handle, three modes — brush, floss, or both at once. Water runs out through the brush head while the bristles work, so a single two-minute session covers everything. Waterpik says it's clinically proven to be up to twice as effective as traditional brushing and flossing for reducing plaque and improving gum health. It's also the only combination device that has earned the ADA Seal for both functions.

Buy this one if the real problem is that you skip steps. Plenty of people brush religiously and floss twice a month. If that's you, collapsing two habits into one reduces the number of chances you get to bail. There's a two-minute brushing timer with a 30-second pacer to keep you moving quadrant to quadrant, and the flosser side gives you the same 10 pressure settings as the Aquarius.

From our review of 8 water flossers for gum health

What we like

• +The pitch is simple: one handle, three modes — brush, floss, or both at once
• +Buy this one if the real problem is that you skip steps
• +It's built for a household

What to know

• –The 16-ounce reservoir is smaller than the Aquarius tank and gives you about 60 seconds of flossing, which is a strange place to…
• –Combination devices have combination failure modes