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Waterpik Aquarius WP-660 Review: The Countertop Flosser Dentists Recommend
The Waterpik Aquarius judged against string floss and cordless flossers. Here's why reservoir and pressure range matter around braces, and what it costs.
By Price Review Team
Waterpik Aquarius WP-660 Review: Countertop Power
The Bottom Line
Buy it if string floss isn't working and you know it. The Aquarius is a mains-powered countertop water flosser with a large reservoir, ten pressure settings and a set of specialist tips. It is not portable and it is not discreet — it is the model to buy if the priority is that flossing actually happens every day.
Who should buy this: Anyone with braces, bridges, implants or crowded teeth. People whose dentist has flagged gum inflammation. Households sharing one unit with separate colour-coded tips.
Who should NOT buy this: Anyone with a small or crowded bathroom counter. Travellers — get the cordless model. People who already floss properly and have no gum issues.
How We Assessed It
Our assessment weighs the Aquarius against string floss and against the cordless Waterpik models, on the things that actually separate them: how a targeted jet handles the places string genuinely cannot reach — under a fixed retainer, through a bridge, around implants — whether ten pressure settings are real utility or spec padding for someone starting out with inflamed gums, and whether the reservoir runs long enough for a thorough pass without a refill, which is where cordless units lose people. We also weighed the costs owners raise: counter space, noise and the mess of the first week.
The Good
Around brackets and bridges it is simply better than string. This is where a water flosser stops being a nice-to-have. Getting floss under a fixed retainer or through a bridge is slow and awkward; a targeted jet does it in seconds. It is the single most consistent thing people with fixed dental work say about water flossers: it turns a chore into a rinse.
Ten pressure settings is genuinely useful, not spec padding. Starting at the low end for the first week is what stops people quitting — inflamed gums bleed and hurt at high pressure. Being able to creep up over a fortnight is how the habit sticks.
The reservoir lasts a full session. Around ninety seconds of continuous run, which is enough for a thorough pass without stopping to refill. Smaller cordless units run dry mid-mouth, which is the main reason people give up on them.
The pulse/massage mode does something. Used along the gum line it's noticeably gentler than the steady jet, which matters because inflamed gums are exactly what makes people quit in week one. Reduced bleeding within a few weeks is the outcome dentists cite when they recommend these.
The Bad
It takes up real counter space. Base unit, reservoir, handle and tips — this is a permanent bathroom appliance, and in a small bathroom that's a genuine cost.
The first week is wet. Everyone sprays the mirror. You learn to lean over the sink with your mouth closed around the tip, but budget for a few messy mornings before the technique clicks.
The hose is a limitation. You're tethered to the base, and the hose eventually kinks where it exits the handle. It's the part most likely to need replacing.
It's noisy. The pump is loud enough to be antisocial early in the morning in a flat with thin walls.
Who It's Really For
Anyone whose dentist has told them the same thing twice. Water flossing is an adjunct to brushing, not a replacement for it, and it isn't magic — but for the specific populations who find string floss genuinely impractical, it converts a task people skip into one they'll do daily. That behavioural change is where all the benefit is.
Final Verdict
Price-Per-Value Rating: 8.7/10
A reservoir and a pressure range that make a thorough daily session easy rather than a chore, plus the specialist tips that make it genuinely useful around orthodontics. The counter footprint, the noise and the initial mess are all real, but none of them undermine the case for anyone with orthodontics or dental work.
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