Head-to-head · Best Water Flossers

Waterpik Aquarius WP-660 vs Waterpik Cordless Advanced 2.0 (WP-580)

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

Waterpik Aquarius WP-660 comes out ahead by a narrow margin (4.6 vs 4.4). The gap is mostly about home users who want the most thoroughly proven, highest-capacity countertop water flosser and have an outlet and counter space — read the strengths below before deciding.

Higher ratedRanked #2 in Best Water Flossers

Waterpik Aquarius WP-660

4.6

$99.99as of Jun 7

The Waterpik Aquarius WP-660 is the countertop water flosser reviewers treat as the benchmark. Ten pressure settings, a big 22 oz reservoir for 90-plus seconds of flossing, seven tips, and two modes make it the most complete and most clinically recommended irrigator you can buy. MedGrade scores it 92/100 and calls it the industry standard. It is loud at high pressure and takes counter space, but for daily home use nothing has a stronger track record.

Strengths

— 10 pressure settings (10-100 PSI) cover sensitive gums to aggressive plaque removal
— Large 22 oz reservoir delivers 90+ seconds of flossing per fill
— Seven included tips cover braces, implants, plaque, and multiple users

Watch-outs

— Motor and stream are noticeably loud at high pressure
— Countertop footprint takes more space than a cordless unit
— Reservoir can develop mold if not dried between uses

$99.99 · Check Price on Amazon Full review →

Ranked #4 in Best Water Flossers

Waterpik Cordless Advanced 2.0 (WP-580)

4.4

$79.99as of Jun 7

The Waterpik Cordless Advanced 2.0 WP-580 is the travel and shower specialist: a slim, IPX7-waterproof handheld that Waterpik and reviewers call the most ergonomic in its cordless line. It charges fast over a magnetic USB connector, lasts up to four weeks, and ships with a travel bag and leak plug. MedGrade scores it 88/100. The 7 oz reservoir means frequent refills and it has only three pressure settings, so it is a portability pick rather than a full-time countertop replacement.

Strengths

— The most ergonomic handheld in Waterpik's cordless line, built for travel and the shower
— IPX7 fully waterproof for confident in-shower use
— Rapid magnetic USB charging reaches full in about 4 hours, lasting up to 4 weeks

Watch-outs

— Small 7 oz reservoir gives only about 45 seconds per fill - frequent refills
— Just three pressure settings (45-75 PSI), narrower than countertop units
— Only four tips included, fewer than the seven on countertop Waterpiks

$79.99 · Check Price on Amazon Full review →

How they stack up

Waterpik Aquarius WP-660

The countertop benchmark - it offers the same 10 pressure settings and 22 oz reservoir as the cordless Waterpik ION Professional WF-12 but plugs in for unlimited run time, beats the budget AquaSonic Aqua Flosser on power and tip selection, and unlike the cordless Waterpik Cordless Advanced 2.0 WP-580 or the Philips Sonicare Power Flosser 3000 it never needs recharging.

Waterpik Cordless Advanced 2.0 (WP-580)

The travel and shower pick - it is far more portable than the countertop Waterpik Aquarius WP-660 and the cordless-but-bulky Waterpik ION Professional WF-12, but its 7 oz tank and 3 settings trail both; it is more compact than the Philips Sonicare Power Flosser 3000 though it holds far less water, and it is a clear step up from the budget AquaSonic Aqua Flosser in build and pedigree.

Specs side-by-side

Spec	Waterpik Aquarius WP-660	Waterpik Cordless Advanced 2.0 (WP-580)
Type	Countertop (corded)	Cordless handheld
Pressure Settings	10 (10-100 PSI)	3 (45-75 PSI)
Reservoir	22 oz (90+ sec)	7 oz (~45 sec)
Tips Included	7	4
Modes	Floss + Hydro-Pulse Massage	—
Pulses	1,400 per minute	—
Timer	1-min timer + 30-sec pacer	—
Warranty	3-year limited	2-year limited
Battery	—	Lithium-ion, up to 4 weeks/charge
Charging	—	Rapid magnetic USB (~4 hr)
Waterproof	—	IPX7

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