Waterpik
Waterpik Aquarius Countertop Water Flosser WP-660
Aquarius · WP-660
Owner verdict · 20 owner reportsUnmatched dental cleaning performance that transforms gum health, offset by plastic build quality and long-term leak issues.Read the full verdict ↓- ✓Countertop unit with a 22 oz reservoir
- ✓10 pressure settings plus a massage mode
- ✓Seven tips
Unmatched dental cleaning performance that transforms gum health, offset by plastic build quality and long-term leak issues.
Buy this for the unmatched dental results and deep cleaning power, not for rugged build quality. Pass if you refuse to air-dry the tank daily or maintain a unit prone to leaks.
Owners consistently rate the Waterpik Aquarius WP-660 as a total game-changer for oral hygiene. Dental results are widely praised, with users reporting dramatic reductions in gum bleeding, inflammation, and pocket depth that traditional flossing could not achieve. The large 22-ounce reservoir provides over 90 seconds of continuous flossing, while 10 adjustable pressure settings and handle-mounted controls make customizing sessions easy—especially for those with braces, implants, or crowns.
However, long-term durability is a major point of contention across the community. Owners frequently criticize the plastic construction as feeling cheap for the price point. Common mechanical issues include water leakage from the hose or base, brittle tubing that cracks over time, noisy motor operation, and sticking power buttons. Units can also develop mold and mineral buildup without meticulous maintenance, including regular vinegar descaling and drying out the tank after every use.
Owners Love
- +Exceptional cleaning performance that noticeably improves gum health and reduces inflammation
- +Large 22-ounce reservoir allows 90+ seconds of continuous flossing without refilling
- +Versatile 10-level pressure customization with convenient handle controls
- +Essential tool for cleaning around braces, crowns, implants, and complex dental work
Owners Flag
- −Frequent reports of leaks from the hose, handle, and reservoir base
- −Plastic components and hose tubing feel cheap and become brittle or crack over time
- −Loud motor operation that increases noticeably at higher pressure settings
- −Requires strict regular maintenance to prevent mold growth and mineral buildup
"We've had the same plug-in waterpik for 10+ years. Still works perfectly."
After 6–12 Months
Long-term ownership requires strict maintenance habits to maintain performance and avoid early failure. Owners emphasize the need to empty and air-dry the reservoir after every use to prevent mold growth, alongside monthly white vinegar flushes to clear hard water mineral deposits. While some units run reliably for a decade, many owners report hose cracking, button sticking, or pump leaks after one to three years of daily use. Replacement tips, handles, and hoses are readily available to keep units functional.
Best for
People with dental work like braces or implants, sensitive gums, or anyone looking to drastically improve their oral health with a high-capacity countertop flosser.
Not for
Travelers, those with minimal counter space, or buyers who expect whisper-quiet operation and zero-maintenance durability.
Verdict based on owner experiences across owner communities. Last updated October 2026. How we build a verdict →
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What owners report, topic by topic
Cleaning & Dental Health
Owners overwhelmingly praise its ability to clear plaque and debris, noting substantial reductions in gum inflammation, bleeding, and pocket depths compared to traditional string floss.
Build Quality & Reliability
The unit feels noticeably plastic and light, with widespread reports of leaks, cracking hose tubing, and pump failures occurring anywhere between six months and a few years.
Maintenance & Hygiene
Keeping the WP-660 hygienic demands daily effort; failing to empty and dry the reservoir after use leads to mold growth, while hard water buildup requires monthly descaling with vinegar.
Ease of Use & Features
The 22-ounce reservoir supports uninterrupted flossing, and owners appreciate the 10 pressure settings, handle on/off toggle, and built-in timer, though motor noise is loud.
Seen what owners report? Check the current price and delivery on Amazon.
🛒 Buy on AmazonSpecifications
- Type
- Countertop
- Settings
- 10
- Reservoir
- 22 oz
Key Features
- ✓Countertop unit with a 22 oz reservoir
- ✓10 pressure settings plus a massage mode
- ✓Seven tips
- ✓ADA Seal of Acceptance
- ✓3-year limited warranty
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