Waterpik Aquarius WP-660: Is It Worth the Counter Space?

Quick Verdict

Yes—the Waterpik Aquarius WP-660 is worth the counter space if you want an adjustable water flosser at home, but skip it if you prefer a compact, nonpowered routine. Its controls and tips offer flexibility, but weigh reports of early failures before spending $99.97.

The white WP-660/660C had 4.6 stars from 158,812 Amazon ratings when checked Nov. 6, 2026. That score cannot guarantee an individual unit’s lifespan or performance.

How We Researched This

We researched this guide using public sources; we did not test the product ourselves. Our assessment draws on the product information, buyer feedback, and independent sources linked below.

Waterpik Aquarius vs String Floss

The Aquarius offers a powered, adjustable approach, while conventional string floss is a simpler nonpowered alternative. The choice depends partly on whether you want a sink-side appliance or a smaller manual tool.

In a randomized single-use study of 70 adults, Goyal and colleagues found that a Waterpik water flosser plus a manual toothbrush reduced whole-mouth plaque by 74.4%, versus 57.7% for string floss plus a manual toothbrush. This short-term result does not guarantee an outcome for this model or every user.

What Buyers Repeatedly Praise

Buyers often describe a satisfying clean and an appliance they like using. Amazon’s summary emphasizes quality and cleaning performance; reviewers frequently say their teeth feel clean afterward. That is a personal impression, not a dental measurement.

One reviewer described the machine as simple to use. Another appreciated the removable container and intensity settings.

What Buyers Repeatedly Complain About

Durability is the clearest recurring concern in Amazon’s review summary. Some buyers report failures after about a year or sooner. One suspected a motor failure, though individual reports do not establish a typical lifespan or cause.

One reviewer reported splashing despite liking the result. The reservoir also needs regular cleaning. Check the limited warranty’s terms before ordering.

Who Should Buy It

Buy the Aquarius if you want a dedicated, customizable water-flossing setup for home. Its pressure controls and modes appeal if you expect to use them and can keep an appliance near the sink. Check the included tips against your needs.

Who Should Skip It

Skip it if a permanent sink-side appliance would be more trouble than its adjustments are worth. The corded base needs counter space and an outlet, making it less appealing for crowded bathrooms or travel.

If you prefer a compact, nonpowered routine, string floss is simpler. Ask your dental professional which routine fits your situation.

Is the Price Fair?

The $99.97 price is fair only if you value the Aquarius’s powered setup over conventional string floss. You are paying for adjustable pressure, multiple tips and modes. If you will not use those options, the expense is harder to justify. Amazon’s price was checked Nov. 6, 2026, and can change.

Key Specs

Pros & Cons

Pros

• Ten pressure settings and seven included tips
• Floss and Massage modes with a timer
• Handle has an on/off control

Cons

• Takes up counter space and requires an outlet
• Some buyers report early failures
• Reservoir needs regular cleaning

FAQ

Is the Aquarius ADA Accepted?

The Amazon product page displays an ADA Accepted claim for this model.

Can it remove particles after string flossing?

One Amazon reviewer reported this result, but it is not guaranteed for everyone.

Can people with braces use a water flosser?

One reviewer said their son used it with braces. Ask your dental professional about your routine and tip.

Will it work with an overseas electrical supply?

Confirm the voltage and plug requirements on the seller’s page before buying for use outside the United States.

Sources

• Amazon product detail and customer review summary — Waterpik Aquarius WP-660/660C (B00HFQQ0VU)
• Waterpik — Aquarius WP-660 official site
• Goyal et al. — Water flosser and string floss plaque-removal study

Where to buy

$99.97 | See price on Amazon →

Check the details on the seller's page before you buy.

All images are AI-generated illustrations.