Top 5 compared
The best water flossers
A jet of water that cleans between teeth and around braces, without the finicky string.
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The top 5 at a glance
A water flosser pulses a thin jet of water through a small tip, along the gumline and into the gaps between teeth, in a minute or two. Cordless ones are handheld, with a small tank built in and a rechargeable battery. Countertop ones plug into a wall outlet and stay by the sink, with a bigger tank in the base.
The cordless ones here are rated IPX7 waterproof and charge over USB, with no plug in the box, so they pack easily for a trip. The countertop ones need an outlet near the sink, and in return have bigger tanks and more tips to share out. Waterpik and COSLUS list the Aquarius and the C20 as ADA Accepted, with the American Dental Association’s Seal of Acceptance.
What matters
- Pressure settings that start very low, for sensitive gums.
- Spare or specialist tips, for braces or a whole family.
- A charge rated in weeks, if it’ll travel.
#1Waterpik Aquarius Water Flosser (WP-660)
$75–$100
A countertop flosser with ten pressure settings plus a massage mode, a 22 fl oz tank for more than 90 seconds of flossing, and seven tips for a whole family, including orthodontic, gum-pocket and plaque tips. Waterpik made the first water flosser in 1962.
What owners say: Teeth feel clean and fresh after it, and the build quality impresses most owners. The weak spot is the pump, which several say gave out after about a year.
Heads up: It plugs into a wall outlet and lives on the counter by the sink, so it won’t travel like the cordless three.
A closer look: Start on setting 1 and step up a level at a time as the gums get used to it, leaning over the sink with lips nearly closed so the water drains away. The tank lifts off for the top rack of the dishwasher, and the timer’s pauses at 30 seconds and a minute say when to move on.
- Orthodontic, gum-pocket and plaque tips
- Tank goes in the dishwasher
- 3-year limited warranty
Best for: The whole family
- Water tank
- 22 fl oz, 90+ seconds
- Settings
- 10 pressures + massage
- Tips in the box
- 7
- Charging
- Corded (wall outlet)
- Good to know
- Timer and pacer; ADA Accepted
#2RUMFFLYE Cordless Water Flosser (FC5570)
$10–$20
Four cleaning modes and twelve pressure levels, so sensitive gums can start very gently and work up, and it remembers the last setting used. The 10 fl oz tank gives over two minutes of flossing, five tips cover braces, gum pockets and the tongue, and one charge lasts up to 60 uses.
What owners say: Strong pressure, plenty of settings and a battery that keeps going for weeks win owners over, and several pack it for trips. Whether it counts as compact is another matter: some call it small, others fairly large.
A closer look: The maker’s tip for beginners and sensitive gums is to start in Soft mode with the lips closed and let the gums get used to it. Push each tip in until it covers the rubber seal, or it can leak, and shut the charging port’s cover before it goes anywhere near the shower.
- Soft mode for sensitive gums
- Braces and tongue-scraper tips
- IPX7 waterproof
- Under 55 decibels
Best for: Beginners easing in gently
- Water tank
- 10 fl oz
- Settings
- 4 modes, 12 levels
- Tips in the box
- 5
- Charging
- USB, 3-hour charge, up to 60 uses, no plug
- Good to know
- Remembers your setting
#3COSLUS Cordless Water Flosser (C20, ADA Accepted)
$30–$50
ADA Accepted, with a 10 fl oz tank, three modes for gentle to thorough cleaning, and a charge that lasts up to 30 days, so a week away needs no cable.
What owners say: Most say it’s far less of a chore than string floss and leaves the mouth feeling really clean. Battery life and power split opinion, and some units broke within a month.
A closer look: Fill the tank with lukewarm water for a gentler first go, and empty it after each use so it dries out between cleans. Being IPX7, it’s fine to use in the shower once the charging port cover is shut tight.
- Braces and tongue tips
- 2-year warranty
Best for: Daily flossing, ADA Accepted
- Water tank
- 10 fl oz
- Settings
- 3 modes
- Tips in the box
- 5
- Charging
- USB cable, 3-hour charge, up to 30 days, no plug
- Good to know
- ADA Accepted, shower-safe
#4Onlyone Cordless Water Flosser (FC5090)
$20–$30
Four pressure modes, from a gentle start for sore or bleeding gums up to a strong clean, a 10 fl oz tank that lasts a full minute, and five color-coded tips, including orthodontic, gum-pocket, tongue and nasal ones.
What owners say: Owners find it cleans well and holds its charge, and like the pressure settings and the tongue tip; a few say it broke within a few months.
A closer look: Each person in the house can take a different colored tip, and Onlyone suggests a fresh one every three months. It charges from any USB port, laptop or power bank in about three hours, though there’s no plug in the box, and it’s fully waterproof, so it can come into the shower.
- Color-coded tips for each person
- Use it in the shower
Best for: Sensitive gums, cordless
- Water tank
- 10 fl oz
- Settings
- 4 pressure modes
- Tips in the box
- 5
- Charging
- USB, 3-hour charge, about 30 days, no plug
- Good to know
- Nasal tip included
#5Aquapik 100 Countertop Water Flosser
$30–$50
A plug-in countertop flosser that costs less than the Aquarius: a 20 fl oz tank, ten pressure levels and eight tips that all turn 360°, from standard jets to orthodontic, gum-pocket, nasal, tongue-scraper and brush heads.
What owners say: Owners like the strong, adjustable jet and a tank big enough for a whole clean without stopping to refill. Whether it runs quietly, and whether the top settings are strong enough, divides them.
A closer look: Three standard jets come in the box, so up to three people can each keep their own, and the specialist heads cover braces, crowns and implants. Start on the lowest of the ten levels and work up over a week or two, then lift the tank off to rinse and dry it after each use.
- All tips turn 360°
- Three standard jets included
- Orthodontic and gum-pocket tips
- Tank lifts off to rinse
Best for: Implants, crowns and braces
- Water tank
- 20 fl oz
- Settings
- 10 pressures
- Tips in the box
- 8
- Charging
- Corded (wall outlet)
- Good to know
- Nasal, tongue and brush tips
How they compare
Swipe sideways or rotate device to see all 5.
| Feature | #1Waterpik Aquarius | #2RUMFFLYE FC5570 | #3COSLUS C20 | #4Onlyone FC5090 | #5Aquapik 100 |
|---|---|---|---|---|---|
| Best overall | Best budget | ||||
| Picked Rating | 9.1 | 8.9 | 8.6 | 8.6 | 8.6 |
| Price | $75–$100 | $10–$20 | $30–$50 | $20–$30 | $30–$50 |
| Water tank | 22 fl oz, 90+ seconds | 10 fl oz | 10 fl oz | 10 fl oz | 20 fl oz |
| Settings | 10 pressures + massage | 4 modes, 12 levels | 3 modes | 4 pressure modes | 10 pressures |
| Tips in the box | 7 | 5 | 5 | 5 | 8 |
| Charging | Corded (wall outlet) | USB, 3-hour charge, up to 60 uses, no plug | USB cable, 3-hour charge, up to 30 days, no plug | USB, 3-hour charge, about 30 days, no plug | Corded (wall outlet) |
| Good to know | Timer and pacer; ADA Accepted | Remembers your setting | ADA Accepted, shower-safe | Nasal tip included | Nasal, tongue and brush tips |
| Best for | The whole family | Beginners easing in gently | Daily flossing, ADA Accepted | Sensitive gums, cordless | Implants, crowns and braces |
| Buy now | Amazon | Amazon | Amazon | Amazon | Amazon |
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