Waterpik Aquarius WP-660 Countertop Water Flosser with 10 Pressure Settings

Waterpik Aquarius WP-660 Countertop Water Flosser with 10 Pressure Settings

By Waterpik · Water Flossers · Health & Lifestyle

  • Countertop reservoir, 22 oz / 90 seconds of flossing
  • 10 pressure settings
  • 7 tips including plaque seeker and orthodontic
  • ADA accepted for gingivitis reduction
  • Built-in timer and pacer

Lowest price seen
~$59.99 (approx.)
from $59.99 at Amazon

Prices are snapshots. Check the current price with the store.

Summary

A corded countertop water flosser with ten pressure settings, a 22 oz reservoir and seven included tips. It is the most clinically studied consumer water flosser, but check your counter space and tolerance for noise before you buy.

Strengths

  • Ten pressure settings span a very gentle 10 PSI to a powerful 100 PSI.
  • The 22 oz reservoir gives 90+ seconds of flossing at the highest setting, or about 4 minutes 45 seconds at the lowest.
  • Seven included tips cover braces, implants, crowns, bridges and periodontal pockets.
  • The 1-minute timer with a 30-second pacer helps you clean each quadrant evenly.
  • A 3-year US warranty is above average for the category.
  • Owners report effective plaque removal and improved gum health.

Weaknesses

  • Noise is the most consistent complaint; Electric Teeth measured up to 72 dB and Dentaly.org rates it poorly for sound.
  • Owners repeatedly report hose and handle leaks that can end in a replacement hose or handle.
  • Mold and mildew can grow on the handle, seams and inside the housing; the manual gives no prevention guidance.
  • The unit is not portable, not waterproof, and cannot be used in the shower.
  • The reservoir lid can be tricky to seal fully, and some users find the footprint large for a small bathroom.
  • New users spray water around until they learn to lean over the sink and start at low pressure.

Verified specifications

ModelWP-660 (white); the color variants WP-662, WP-663, WP-665 and WP-667 share the same specifications.
Region and powerUS 120 VAC, 60 Hz, North America only.
Operationcountertop, corded electric.
Flow rate13 oz/min (384 ml).
Pulses per minute1,400.
Pressure settings10, ranging from 10 PSI to 100 PSI.
Included tips7 total, four JT-100E Precision, one OD-100E Orthodontic, one PP-100E Pik Pocket and one PS-100E Plaque Seeker.
Handle controlson/off slider and a tip that rotates 360 degrees.
Timer1-minute timer with a 30-second pacer.
ModesFloss and Hydro-Pulse Massage.
IndicatorLED function light.
CertificationsADA Seal of Acceptance and FDA 510(k) clearance.
Warranty3-year limited in the US (2 years in the UK).
Dimensions10.35 × 4.70 × 3.80 in (26.29 × 11.94 × 9.65 cm); 1.46 lb (0.662 kg).
Cord and hose52 in (about 4.3 ft) cord and about 3.2 ft of hose, roughly 7 ft of reach from outlet to sink.
In the boxthe flosser unit with handle, hose and reservoir, plus four precision, one orthodontic, one plaque seeker and one pik pocket tip.
Not includedthe TB-100E toothbrush tip, implant/denture, tongue cleaner and tip storage case, which are the WP-670 Professional’s additions.
Full research notes and sources

Pressure settings and daily use

The ten settings run from 10 PSI for sensitive gums to 100 PSI for heavy cleaning, and most users settle around level 7 while beginners start near level 3. The 22 oz reservoir lasts 90+ seconds at the top setting and about 4 minutes 45 seconds at the lowest, so a single fill covers more than one pass. The 1-minute timer with a 30-second pacer walks you through the four quadrants.

Seven tips ship in the box: four precision tips for daily use, an orthodontic tip for braces, a plaque seeker tip for implants, crowns, bridges and retainers, and a pik pocket tip for periodontal pockets. The tip rotates a full 360 degrees and the handle has an on/off slider. Expect a learning curve; new users spray water until they learn to lean forward and close their lips around the tip. The unit is not waterproof, so keep it out of the shower.

Noise

Noise is the drawback owners bring up most. Electric Teeth measured up to 72 dB and called it pretty average rather than ultra quiet, while Dentaly.org gives it poor marks and quotes users describing it as insanely loud or like a car engine. It gets louder as you raise the pressure setting. If a quiet routine matters more than power, weigh that before buying.

Leaks, mold and repairs

The recurring owner complaints are practical. A long r/BuyItForLife thread titled “Waterpik is not BIFL” describes the hose developing a hole, a replacement hose and handle lasting only 2 months, and the machine then leaking from the bottom. r/fixit has several threads about leaks at the base of the handle, with commenters recommending a new handle-and-hose assembly and warning against cheap aftermarket hoses. Dentaly.org lists leaks on the wand, cord and tank as commonly reported.

Mold is the second theme. Many reviews mention mold on the rubber part of the handle, along seams and inside the housing, including one report of growth after 3 years that bleach wipes could not remove. The manual offers no mold guidance, but owners advise emptying the reservoir after use, drying the wand before storage and running a vinegar solution periodically. Motor failures also show up in r/fixit, with one owner fixing a dead unit by lubricating the motor; others report no water despite the motor running. Nobody has published a failure rate, so treat these as known annoyances rather than defects.

Maintenance is simple: clean the unit every 1-3 months, use only Waterpik-approved parts, and never open the housing, which voids the warranty. If the hose leaks, Waterpik’s guidance is to contact its service center. The company states it does not guarantee the availability of replacement parts or repair services, though it does sell some parts and tips through its store, and aftermarket hoses exist but owners say they can break quickly.

Running costs

The only consumables are tips. Electric Teeth estimates about $5 per replacement nozzle over 3 years for a total near $95, and MedGrade estimates $14.99 per 2-pack replaced quarterly, with a first-year cost near $159.95 including the device. Tips should be replaced every 3-6 months. Beyond that you pay for descaler, vinegar and electricity; there is no subscription or capsule lock-in.

Is it worth it?

At $70 or less it is a strong buy: the clinical evidence base, ADA acceptance, ten pressure settings, seven tips and 3-year warranty are hard to match. Between $71 and $90 it is still good value if you want clinical efficacy and tip variety over portability, and from $91 to $110 it is fair against cordless options. Above $110 the value weakens, because the main tradeoffs are bulk and noise. Waterpik’s own store listed it at $59.99 to $79.99 on sale from a $99.99 MSRP (Waterpik store, 2026), and Consumer Reports lists it at $54.99. It makes the most sense for someone who wants the most proven countertop water flosser and has the counter space and outlet to accommodate it.

Which model this is

This page covers the Aquarius WP-660 in white, the standard Aquarius with no chrome accents, LCD or magnetic handle. The WP-662, WP-663, WP-665 and WP-667 are the same machine in black, blue, orchid and gray. The WP-670 Aquarius Professional adds chrome accents, a tip storage case and one extra toothbrush tip but performs identically. Don’t confuse it with the older WP-100 Ultra, the WF-100 Ultra or the cordless WP-560 and WP-580. The US listing’s ASIN is B00HFQQ0VW.

Sources

Manufacturer:

Independent reviews:

Owner reports:

Buying guides for this category

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