Waterpik Aquarius WP-660 Review
Quick Verdict
The Waterpik WP-660 is the gold standard of water flossers. Dentist-recommended and clinically proven more effective than string floss for reducing gum disease. Not the cheapest but the results speak for themselves.
Pros & Cons
Pros
- Clinically proven to reduce gingivitis by up to 51%
- 10 pressure settings from gentle to deep clean
- Large 22oz reservoir — no refilling mid-session
- ADA accepted for safety and efficacy
- Great for braces, implants, and gum sensitivity
Cons
- Bulky countertop size — not travel-friendly
- Messy for beginners until you learn the angle
- Pricier than basic flossers or string floss
- Reservoir lid can be tricky to seal fully
Specifications
| Reservoir | 22oz |
|---|---|
| Pressure Settings | 10 |
| PSI Range | 10–100 |
| Tips Included | 7 |
| Colors | White / Black |
| Warranty | 2 Years |
| ADA Accepted | Yes |
Full Review
Overview
The Waterpik Aquarius WP-660 has been the countertop water flosser to beat since its release. It pairs a high-volume 22oz reservoir with a precision handle, 10 clinically calibrated pressure settings, and a motor that delivers a consistent stream from 10 to 100 PSI. Everything about the design signals permanence: the unit sits firmly on a bathroom counter, the hose retracts neatly, and the tip storage is built directly into the lid.
We used the WP-660 as our primary flossing method for six weeks across a three-person test panel that included braces, sensitive gums, and dental implants. The data we gathered backs up Waterpik’s claims: when used daily, the WP-660 reduced visible gum inflammation faster than string floss and was dramatically easier to use around orthodontic hardware. It is the water flosser most dentists recommend — and after our testing, we understand why.
Performance
Performance is where the WP-660 earns its 9.5. Independent clinical studies show up to a 51% reduction in gingivitis after three months of consistent use, and our testers saw healthier, less bleeding gums within two weeks. The 10 pressure settings make a real difference: setting 1–3 is gentle enough for first-time users and inflamed tissue, while settings 8–10 deliver a deep massage that dislodges debris below the gumline ordinary floss cannot reach.
The included tips are purpose-built. The orthodontic tip threads around brackets, the plaque seeker targets implants and bridges, and the Pik Pocket tip is ideal for periodontal pockets. Each tip snaps in with a satisfying click and rotates 360 degrees, so you can reach every quadrant without twisting your wrist. Compared to cordless competitors, the countertop motor produces a stronger, steadier stream that never weakens mid-session.
Ease of Use
The controls are minimal and intuitive: a power button, a pressure dial, and a mode switch for floss or massage. Filling the 22oz reservoir takes seconds under a faucet and lasts for roughly 90 seconds of continuous use at medium pressure — enough for a full mouth without stopping to refill. The handle pause button lets you stop the stream instantly, which is more useful than it sounds during the first few sessions.
There is a learning curve. New users tend to spray water everywhere until they close their lips around the tip and lean forward over the sink. We recommend starting on setting 2 and working up over a week. Once you find the right angle, the routine becomes as automatic as brushing. Cleanup is simple: the reservoir removes for draining, the handle hose retracts, and the tips store inside the lid so nothing gets lost.
Value for Money
At $45–$70, the WP-660 sits in the middle of the water flosser market. Basic battery-powered models cost half the price but lack the pressure range, reservoir size, and durability. Premium models from the same brand add Bluetooth and apps most users do not need. For the average household, the WP-660 offers the best balance of clinical effectiveness and long-term reliability.
Cost-per-use math is compelling. Replacement tips run about $15 for a two-pack and last six months each. Even at the high end of the price range, the WP-660 pays for itself compared to years of string floss, and the health benefits — reduced gum disease risk, cleaner implants, easier braces care — are difficult to put a price on. The two-year warranty is also better than most competitors offer at this price.
DCR Score Breakdown
How we scored the Waterpik WP-660 across five categories.
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