Is the Waterpik Aquarius WP-660 worth it?

For most people who skip string floss or wear braces, yes. It is a proven countertop model with adjustable pressure and a large reservoir, and at $79.97 at Walmart as of November 7, 2026 it is priced near the low end of its range.

How is it different from the Waterpik WP-100?

The Aquarius adds a 1-minute timer with a 30-second pacer, a flip-top reservoir lid and a more compact body. Both use the same style of tips and 10 pressure settings.

Can I use it with braces or implants?

Yes. It includes an orthodontic tip for braces and a plaque-seeker tip for implants, bridges and crowns. Start on the lowest pressure setting.

How often do I refill the reservoir?

The reservoir holds about 90 seconds of water at low to mid pressure. Most users finish a full session on one fill, but high pressure settings may need a refill.

Does it come with tips for the whole family?

Yes. It ships with 7 color-coded tips, including the classic jet tip, orthodontic tip, plaque seeker and tongue cleaner, so each person can use their own.

When is the price lowest?

It dips during oral care sales and holiday events, often to around $70. At $79.97 at Walmart as of November 7, 2026, it is already close to that floor.

Where is the Waterpik Aquarius Water Flosser WP-660 cheapest?

At eBay, for $19.99, 75% under what the other stores charge, as of our latest check.

What do buyers say about the Waterpik Aquarius Water Flosser WP-660?

Rated 4.6 out of 5 from 2,863 ratings.

Where can I buy the Waterpik Aquarius Water Flosser WP-660?

12 stores we checked sell it, including Mercari, Scott's Dental Supply, Hygiene Direct, eBay, Poshmark.

Waterpik Aquarius Water Flosser WP-660

Best price now

$19.99at eBayObserved at 12:34 AM

75% under what the other stores charge

Compared across 8 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission.

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What reviewers say

4.6 / 52,863 ratings

Owners rate it highly and most say it leaves their mouth feeling cleaner than string floss alone. Complaints center on the counter footprint, the noise at high pressure and water splashing while you learn to use it.

What people mention

Gum healthPraisedOwners report less bleeding and cleaner-feeling gums after a few weeks of daily use.
NoiseCriticisedSeveral say the motor is loud, especially at the higher pressure settings.
SizeMixedThe countertop footprint is fine for some and too bulky for small bathrooms.
Ease of usePraisedThe rotating handle and timer make it easy to reach back teeth and cover the whole mouth.
MessCriticisedNew users complain about water splashing until they learn to keep their mouth mostly closed.
Braces and dental workPraisedPeople with braces, bridges and implants say it cleans where string floss cannot reach.

About the Waterpik Aquarius Water Flosser WP-660

The Waterpik Aquarius water flosser (WP-660) is designed for a wide range of users seeking a more effective and convenient way to maintain daily gum health and oral hygiene. It is especially ideal for people with braces, implants, bridges, or crowns, as it helps clean areas that traditional floss often cannot reach. Those with sensitive or bleeding gums can benefit from its adjustable pressure settings, allowing them to start at the lowest level and gradually increase intensity as gum health improves. It is also a great alternative for individuals who find traditional string floss difficult or cumbersome to use. The unit is family-friendly, featuring 7 color-coded tips so multiple users can safely share the same device, and it is suitable for children ages 6+ when used under adult supervision, beginning on the lowest setting. Designed for convenience, it requires just one minute per day, making it easy to incorporate into even the busiest routines. The 7 specialty flossing tips address a variety of dental needs (orthodontics, periodontal pockets, dental work). The 1-minute timer with 30-second pacer ensures thorough water flossing of all areas, and a removable water reservoir with flip-top lid makes it easy to fill. The special 360-degree rotating tip handle easily reaches your whole mouth, even back teeth. This electric plug-in countertop model measures 4.7 x 10.35 x 3.8 with tip at the base (WxHxD inches). The Waterpik Aquarius water flosser removes up to 99.9% of plaque bacteria that causes gingivitis, bleeding gums, cavities, and bad breath from treated areas and is clinically proven up to 2X as effective as string floss for removing bacterial plaque and improving gum health. Waterpik is the #1 water flosser brand recommended by dental professionals, and the Waterpik Aquarius water flosser is accepted by the American Dental Association (ADA) for safety and effectiveness. Backed by a 3-year manufacturer's limited warranty, see product manual for details.