At a Glance#
Product : Waterpik Aquarius Water Flosser WP-660
Brand : Waterpik
Best For : Brace-wearers, implant and crown owners, and anyone whose gums bleed with string floss
Form Factor : Corded countertop unit with 22oz removable reservoir
Buy Now : View on Amazon
Key Highlights:
- 10 pressure settings let you start gentle and build up as gums toughen
- Seven tips in the box: four Precision jet tips plus Orthodontic, Pik Pocket and Plaque Seeker
- 22oz reservoir gives 90+ seconds of uninterrupted flossing
- Built-in 1-minute timer with a 30-second pacer tracks coverage
- 360-degree rotating tip handle reaches back molars, with two modes: Floss and Hydro-Pulse Massage
Who Should Buy This#
The Aquarius WP-660 hits a sweet spot for people who find string floss painful, fiddly, or simply ineffective around dental work. It delivers ADA-accepted plaque removal, seven tips in the box, and a 10-step pressure dial you can climb one notch at a time.
Perfect for:
- Brace-wearers who can't thread floss under wires and need the orthodontic tip to clear food and plaque around brackets
- Implant and crown owners who want to protect expensive dental work without aggressive scraping
- People with sensitive or bleeding gums who need to start at low pressure and increase it gradually as gums heal
- Anyone who hates string floss and has quietly skipped it for years despite the dentist's warnings
Design & Build Quality#
The Aquarius takes a familiar countertop shape: a weighted base housing the pump and motor, topped by a 22oz (651 ml) reservoir that lifts off for filling and goes in the top rack of the dishwasher. Waterpik gives the unit as 10.35 inches tall with a 4.70 x 3.80 inch base and 1.46 lbs, so it takes about as much counter as a tall travel mug, and the cord is 52 inches.
The handle is the standout. A water on/off slider sits under your thumb so you can stop the flow without reaching for the dial on the base, and the tip rotates a full 360 degrees so you can angle it at upper molars and the back of your mouth without twisting your wrist. Tips click in and eject with a button, and the manual is precise about storage: "Accessory tip storage for your two most frequently used tips is under the reservoir lid and can be easily accessed by removing the reservoir."
Key Features#
10 Pressure Settings From Gentle To Deep Clean#
The Aquarius offers 10 pressure levels on a dial on the base. Waterpik does not publish the pressures in PSI, but the step count is the point: the lowest setting is the one the manual tells first-time users to start on, and there are nine more above it.
That range matters because gum tolerance changes. Waterpik's own instruction is to set the dial to No.1 for first-time use and increase gradually over time, or as your dental professional instructs. The Aquarius also carries two modes, Floss and Hydro-Pulse Massage, selected with a mode button and shown on an LED panel.
Seven Tips For Every Dental Need#
Where many flossers ship with a single jet tip, the WP-660 includes seven. Waterpik lists the box contents precisely: four JT-100E Precision tips for everyday flossing, one OD-100E Orthodontic tip for braces, one PP-100E Pik Pocket tip for periodontal pockets and furcations, and one PS-100E Plaque Seeker tip for implants, crowns and bridges.
For households, that means multiple people can keep their own colour-coded tips. Note what is NOT in the box: the Toothbrush tip, the Tongue Cleaner and the Implant Denture tip are all listed by Waterpik under accessories available for the unit, sold separately.
Built-In Timer And Pacer#
A 1-minute timer with a 30-second pacer briefly interrupts the flow to signal when you're halfway through and when a full minute is up. It's a small touch that solves a real problem: most people floss too quickly and miss entire quadrants.
Read the pacer for what the manual actually says it does: the 30-second pause is there "to remind you to move to the other arch of your mouth", and the 1-minute pause signals the end of the recommended cleaning time. Two halves, not four quadrants. The timer can be switched off in the unit's settings if you would rather not be interrupted.
Clinically Proven Plaque Removal#
These are Waterpik's own published claims, and they are the reason the product exists. Waterpik's product page states it is the #1 water flosser brand recommended by dental professionals, and its retail listing adds that it was the first water flosser brand to earn the American Dental Association Seal of Acceptance for safety and effectiveness. Note Waterpik's broader corporate wording is narrower still — "the first powered interdental product" to earn the Seal. It says the Aquarius removes up to 99.9% of plaque bacteria from treated areas, and is clinically proven up to 2X as effective as string floss for removing plaque and improving gum health, up to 2X as effective around implants using the Plaque Seeker tip, and up to 3X as effective for removing plaque around braces versus brushing and string floss using the Orthodontic tip. The plaque figure carries Waterpik's own footnote: laboratory study, data on file.
We have not tested any of that, and none of it is medical advice — ask your dentist what belongs in your routine. Check current availability: View on Amazon
Technical Specifications#
Pressure Range : 10 settings on a base dial (Waterpik publishes no PSI figures)
Pulse Rate : 1,400 pulses per minute
Flow Rate : 13 ounces (384 ml) per minute
Reservoir Capacity : 22 ounces (90+ seconds of flossing)
Included Tips : 7 (4x Precision JT-100E, Orthodontic OD-100E, Pik Pocket PP-100E, Plaque Seeker PS-100E)
Timer : 1-minute timer with 30-second pacer, deactivatable
Modes : Floss and Hydro-Pulse Massage, with LED mode indicators
Reservoir : 22 oz (651 ml), covered, top-rack dishwasher safe
Size and Weight : 10.35 in high, 4.70 x 3.80 in base, 1.46 lbs; 52-inch cord
Tip Rotation : 360 degrees
Power : Corded; 120VAC/60Hz, for use in North America only
Dental Acceptance : ADA Accepted Seal
Warranty : 3-year limited manufacturer warranty
Color : White (also sold in black and other finishes)
Pros & Cons#
Pros:
- Waterpik claims removal of up to 99.9% of plaque bacteria from treated areas
- 10 pressure settings adapt from sensitive gums to deep cleaning
- Seven tips in the box cover braces, periodontal pockets, implants and everyday flossing
- 22oz reservoir delivers 90+ seconds of continuous flossing
- Built-in timer and 30-second pacer track full-mouth coverage, and can be switched off
- ADA Seal of Acceptance, plus a separate Hydro-Pulse Massage mode for gum stimulation
- 360-degree rotating handle and an on-handle water slider reach back teeth without strain
Cons:
- 120VAC/60Hz only, and Waterpik states it is for use in North America only
- Countertop footprint needs dedicated sink-side space, and the cord ties it to an outlet
- The Toothbrush, Tongue Cleaner and Implant Denture tips are sold separately, not included
- At 13 oz a minute against a 22 oz reservoir, a thorough session can empty it in under two minutes
- Water can spray if you switch it on before the tip is in your mouth
FAQ#
Q: Is the Waterpik Aquarius WP-660 good for braces? A: Waterpik includes a dedicated Orthodontic tip for brackets and wires, and states the flosser is clinically shown to be up to 3X as effective at removing plaque around braces versus brushing and string floss when that tip is used.
Q: What is the difference between the WP-660 and cordless Waterpik models? A: The WP-660 is a corded countertop unit with a 22 oz reservoir, a 10-step pressure dial and a built-in timer. Cordless models are smaller and travel-friendly but hold less water and offer fewer pressure levels.
Q: Does the Waterpik Aquarius replace brushing? A: No. Waterpik positions the water flosser alongside a toothbrush, not instead of one. Ask your dentist what belongs in your routine.
Q: Will it work outside North America? A: Not on its own. Waterpik specifies 120VAC/60Hz and states plainly that the WP-660 is for use in North America only, so a plug adapter is not enough.
Q: How many tips come in the box? A: Seven — four Precision jet tips, one Orthodontic, one Pik Pocket and one Plaque Seeker. The Toothbrush tip, Tongue Cleaner and Implant Denture tip are sold separately.
Final Verdict#
Buy it. The Waterpik Aquarius WP-660 pairs an ADA Seal of Acceptance with seven tips in the box and a ten-step pressure dial. Worth knowing before you commit: Waterpik's own comparison puts the WP-670 on the same 10 settings and the same 7 tips, with one more tip type, so this is the value point in the range rather than the top of it.
Our recommendation: If you have braces or implants, the Orthodontic and Plaque Seeker tips are the reason to pick this model over a single-tip flosser. Follow Waterpik's own instruction and set the dial to No.1 for the first sessions, then increase gradually. North American outlets only. Get it now: View on Amazon