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Cleaning between your teeth can be awkward, especially when string floss is difficult to use around braces, bridges, crowns, or back teeth. The Waterpik Aquarius Water Flosser WP-660 gives you a countertop alternative with 10 pressure settings, seven included tips, a 22 oz covered reservoir, and more than 90 seconds of water capacity. Its strongest points are control, tip selection, and a built-in timer, but it needs counter space and a North American 120V outlet. This review helps you decide whether those tradeoffs fit your daily oral-care routine.
Quick Verdict
Rating: 8.8/10, Recommended with caveats
Best For: Daily home use, braces, crowns, bridges, implants, and buyers who want fine pressure control.
Bottom Line: The Aquarius WP-660 is a well-equipped countertop water flosser with 10 pressure levels, seven specialized tips, and a generous reservoir. It is less attractive for travel or small bathrooms because it is corded and designed for 120VAC/60Hz North American power.
| Specification | Detail |
|---|---|
| Brand | Waterpik |
| Model | Aquarius WP-660, white |
| Product type | Countertop water flosser |
| Pressure settings | 10 |
| Modes | Floss and Hydro-Pulse Massage |
| Reservoir | 22 oz (651 ml), covered and removable, 90+ seconds of use |
| Included tips | 7 total: 4 Precision, 1 Orthodontic, 1 Plaque Seeker, 1 Pik Pocket |
| Tip rotation | 360 degrees |
| Timer | 1-minute timer with 30-second pacer |
| Pulses | 1,400 per minute |
| Dimensions | 10.35 in high with tip, 4.70 in max width, 3.80 in max depth |
| Unit weight | 1.46 lb |
| Power | Corded, 120VAC/60Hz, North America only |
| Cord length | 52 in |
| Warranty | 3-year limited warranty |
| Acceptance | ADA Seal of Acceptance for Waterpik countertop family water flossers |
What Is the Waterpik Aquarius WP-660?
The Aquarius WP-660 is a corded countertop oral irrigator made for daily cleaning along the gumline and between teeth. Waterpik equips it with a pressure dial that runs from level 1 to 10, a handle-mounted water on/off slider, a 360-degree rotating tip control, and two operating modes. The 22 oz reservoir is large enough for more than 90 seconds of flossing without a refill.
The seven-tip package makes the WP-660 more flexible than a basic single-tip flosser. You get four Precision tips for general use, plus an Orthodontic tip for braces, a Plaque Seeker tip for implants, crowns, bridges and similar dental work, and a Pik Pocket tip designed for periodontal pockets. The model also stores two frequently used tips under the reservoir lid.
Power your essentials anywhere with a 999Wh pure sine wave power station delivering up to 1000W continuous with 2000W surge. It supports fast charging via USB-C PD 60W and USB-A QC 18W, plus simultaneous output for multiple devices through AC, USB, wireless, and car/DC ports. Recharge using AC, car, or solar with a built-in MPPT controller and dual cooling fans, while the upgraded battery management system protects against surges, short circuits, and overheating.
[ Clean Teeth Deeply, Whiten Teeth Powerful and Improve Gum Health]: oral irrigator improves gum better health compared with toothbrush,toothpick or floss which can’t completely clean the hidden parts. With powerful pulsations, it can more efficiently remove food debris hidden deep and massage your gum,reduce teeth stain, bad breath and other oral problems. It’s perfect teeth cleaner for people with braces, implants, crowns.
ADVANCED WATER FLOSSING: Aquarius is a fully featured water flosser featuring enhanced pressure with 10 settings for a custom clean, massage mode for gum stimulation, plus a built-in timer/pacer pauses briefly at 30 secs and 1 min to track flossing time
Why Choose the Waterpik Aquarius Over String Floss?
A water flosser can be easier to handle when you struggle to thread floss around orthodontic hardware or dental restorations. The ADA Seal statement for Waterpik countertop family water flossers says the products are safe and have shown effectiveness for removing plaque along the gumline and between teeth and for helping prevent or reduce gingivitis when used as directed.
That does not mean you should treat the WP-660 as a substitute for brushing. The ADA recommends brushing twice daily and cleaning between teeth once daily with floss or another interdental cleaner. If your dentist has given you a specific cleaning routine, follow that guidance instead of relying on a general product routine.
Who Should Buy It?
Best For
- You want a countertop flosser with precise pressure adjustment.
- You have braces, crowns, bridges, implants, or other areas that are awkward to clean with string floss.
- You prefer a larger reservoir that can cover a full session without refilling.
Skip If
- You need a cordless model for travel or shower use.
- You have very limited counter space near a suitable outlet.
- You need global-voltage compatibility outside North America.
Before You Buy: The WP-660 is rated for 120VAC/60Hz North American outlets. Do not assume a simple plug adapter makes it suitable for another voltage system, because the manufacturer warns that using the wrong voltage can damage the unit and void the warranty.
Top Features of the Waterpik Aquarius Water Flosser
10 Pressure Settings and Two Modes
The 10-level pressure dial gives you more control than a simple low, medium, and high setup. Waterpik instructs first-time users to begin at pressure level 1 and increase gradually to a comfortable setting or the level recommended by a dental professional. That wide range is useful when more than one person uses the base or when your comfort level changes.
Floss mode is the primary cleaning mode. Hydro-Pulse Massage changes the pulsation pattern for gum stimulation. Waterpik’s manual recommends completing the one-minute flossing routine first, then using Massage mode if you want it.
22 oz Reservoir and 90+ Seconds of Water
The covered 22 oz reservoir holds 651 ml and provides more than 90 seconds of water capacity. That is enough for the built-in one-minute routine with time left for slower passes around orthodontic work or hard-to-reach back teeth. The reservoir lifts off the base, which also makes filling and cleaning easier.
Seven Tips for Different Dental Needs
The included tip set is one of the WP-660’s biggest strengths. The four Precision tips support general use and make it easier to assign separate tips to different household members. The Orthodontic tip is shaped for cleaning around brackets and wires, while the Plaque Seeker tip uses small bristle tufts for areas around implants, crowns, bridges, retainers, and general use.
The Pik Pocket tip has a more specialized purpose. Waterpik’s manual says to use it at the lowest pressure setting for periodontal pockets. If you have gum disease, recent dental work, pain, bleeding that concerns you, or instructions from a dentist or periodontist, follow professional guidance rather than increasing pressure on your own.
Timer, Pacer, and 360-Degree Tip Rotation
The timer and pacer help you divide the routine evenly. The unit briefly changes its pacing at 30 seconds and one minute, giving you a simple cue to move from one arch to the other and finish the main floss cycle. The 360-degree tip control lets you change the direction of the water stream without twisting your whole wrist, which is useful at the back of the mouth.
Pro Tip: For your first normal flossing session, start at pressure level 1, lean over the sink, place the tip in your mouth before turning the water on, and increase pressure only after you are comfortable with the flow.
How to Use It Correctly
For first-time setup, fill the reservoir with lukewarm water, insert the tip until it clicks, and prime the unit by pointing the tip into the sink and running it on high until water flows. Priming at high pressure is only part of setup. For actual first-time flossing, return the pressure dial to level 1.
During use, put the tip in your mouth before switching the water on. Lean over the sink and keep your lips slightly closed so water can drain without spraying. Aim the stream at roughly a 90-degree angle to the gumline, begin with the back teeth, glide along the gumline, and pause briefly between teeth. Clean both the inside and outside surfaces of the upper and lower teeth.
Warm water is enough for routine use. If you add standard mouthwash or another dentist-recommended solution, follow Waterpik’s instructions and rinse the unit afterward with plain warm water to reduce clogging or residue. Do not add iodine or water-insoluble concentrated essential oils.
How It Performs in Real Use
For Everyday Home Use
The WP-660 works best as a stay-on-the-counter appliance. You can fill the large reservoir, select your pressure, and complete a timed routine without stopping for a refill. The handle’s water control is useful when you need to pause briefly without reaching for the power button.
For Braces and Orthodontic Hardware
The Orthodontic tip is designed to move along the gumline and around brackets. The combination of a narrow tip, 360-degree rotation, and adjustable pressure makes the Aquarius easier to direct around hardware than a single-position stream. You still need to follow your orthodontist’s cleaning instructions, especially if you have irritated tissue or new appliances.
For Crowns, Bridges, and Implants
The Plaque Seeker tip is intended for targeted cleaning around dental work, with gentle bristle contact plus water flow. This gives the WP-660 a practical advantage over models that include only general-purpose tips. Use light contact and follow your dentist’s instructions for implant or restoration care.
For Travel
This is not the model’s strongest use case. At 10.35 inches high with the tip fitted, a corded base, a separate reservoir, and North America-only voltage, it is better suited to a bathroom counter than a suitcase. A cordless or global-voltage Waterpik is a better match if travel is a priority.
Cleaning, Maintenance, and Safety
The removable reservoir is top-rack dishwasher safe, or you can wash it by hand with warm soapy water. Waterpik’s current support guidance recommends regular cleaning for optimal performance, and the WP-600 series manual gives a hard-water cleaning routine using white vinegar and warm water every one to three months. After any vinegar or mouthwash cycle, run clean warm water through the unit.
Tip replacement depends on the tip type. The manual marks Orthodontic, Pik Pocket, and Plaque Seeker-style specialty tips for replacement every three months, while the general Classic/Precision-style jet tip is typically replaced every six months. Replace damaged tips sooner.
Because the Aquarius is an electrical bathroom appliance, keep the plug and base away from water and do not handle the plug with wet hands. Do not use the flosser on open wounds in the mouth, and do not direct the stream into the nose, ears, or other delicate areas. Children should be supervised and should not play with the unit.
Pros and Cons
Pros
- 10 pressure settings give you fine control over water intensity.
- 22 oz reservoir supports 90+ seconds of uninterrupted use.
- Seven included tips cover general use, braces, dental work, and periodontal-pocket care.
- One-minute timer and 30-second pacer support a consistent routine.
- ADA-accepted Waterpik countertop family design provides third-party support for plaque and gingivitis claims when used as directed.
Cons
- Corded countertop design takes more space than a handheld flosser.
- 120VAC/60Hz rating limits straightforward international use.
- Multiple specialty tips require cleaning, storage, and periodic replacement.
Is It Worth the Price?
The Aquarius WP-660 sits above basic water flossers because you are paying for a larger pressure range, a full set of specialized tips, a timer and pacer, two modes, and a large covered reservoir. It offers strong value if you will use those features daily, especially when braces or dental work make a general-purpose tip less convenient.
It is less compelling if you only want a simple stream between teeth, have almost no counter space, or travel often. In those cases, a smaller cordless model may give you more practical value even if it has fewer pressure settings or a smaller tank.
How It Compares to Alternatives
Compared with the Waterpik Ultra WF-100, the Aquarius WP-660 keeps the same 10 pressure settings and 22 oz reservoir but adds Massage mode, a timer/pacer, an LED function indicator, and two more included tips. The Ultra is a simpler choice if you do not care about those convenience features.
The Waterpik ION Professional is a better comparison for buyers who dislike countertop cords. It uses a rechargeable battery and global-voltage-compatible charging, while the WP-660 stays corded and North America-only. The Aquarius makes the most sense if you prefer a traditional plug-in setup, 1,400 pulses per minute, seven included tips, and the 22 oz reservoir.
Frequently Asked Questions
How often should you use the Waterpik Aquarius WP-660?
Waterpik recommends daily water flossing for routine oral hygiene. The ADA also recommends cleaning between your teeth once a day with floss or another interdental cleaner, so the WP-660 can fill that role when it suits your needs.
Can the Waterpik Aquarius replace string floss?
A water flosser is an accepted type of powered interdental cleaner, and many people use one instead of string floss for daily cleaning between teeth. Your dentist may still recommend string floss, interdental brushes, or a specific method for certain spaces, restorations, or gum conditions.
Is the WP-660 suitable for braces, crowns, bridges, or implants?
Yes, the included Orthodontic tip is intended for braces, and the Plaque Seeker tip is intended for implants, crowns, bridges, retainers, and general use. Use gentle technique and follow any cleaning instructions from your dentist or orthodontist.
What water should you put in the Waterpik Aquarius?
The manual recommends lukewarm water. Filtered water is not required, but hard-water minerals can build up over time, so periodic internal cleaning is useful when your water has high mineral content.
Can you use mouthwash in the reservoir?
Waterpik allows standard mouthwash and certain dentist-recommended solutions, but the unit should be flushed with plain warm water afterward. Do not use iodine or water-insoluble concentrated essential oils because the manufacturer says they can reduce performance and shorten product life.
Can children use the Waterpik Aquarius?
Children who can follow the instructions may learn to use a water flosser with adult supervision. The WP-660 manual specifically says children should be supervised so they do not play with the appliance, so do not treat it like an unsupervised bathroom toy.
How often should you clean the WP-660 and replace its tips?
Clean the reservoir regularly and follow Waterpik’s cleaning guidance for the internal water path, especially if you have hard water. The manual calls for replacement of several bristled or specialty tips about every three months and general jet tips about every six months.
The Bottom Line
The Waterpik Aquarius WP-660 is a strong choice if you want a full-size home water flosser with 10 pressure settings, a large reservoir, seven included tips, and guided timing. Skip it if you need cordless portability, global-voltage support, or a very small bathroom footprint. Its main strength is flexible daily cleaning for different dental needs, while its main limitation is the corded North America-only countertop design.
