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Brushing cleans three of each tooth’s five surfaces. The other two face the neighbouring teeth, and that’s where a lot of gum disease and decay starts. The Sonic-Fusion’s idea is simple: if you won’t pick up a second device to clean between your teeth, put that device inside the toothbrush.
How the flossing head works
The handle connects by a hose to a countertop base with a water tank. You brush with the sonic head, then switch to flossing mode and a jet of water comes through the centre of the head. You can also brush and floss together. It takes some practice to avoid splashing, as every water flosser does.
Who it really suits
- Braces wearers, for whom string floss is miserable and a water jet under the wire is much easier.
- People with bridges or implants, where water flossing is often recommended.
- Non-flossers, because the friction of a second step is what stops most people.
The downsides
It’s large, needs counter space and a sink-side spot near a socket, and isn’t something you’d pack for a trip. It costs much more than a good brush plus a basic water flosser bought separately, so its value is convenience.
| Cleaning action | Sonic brush with built-in water flosser |
|---|---|
| Brushing modes | 3 (Brush, Floss, Brush and Floss) |
| Intensity levels | 2 brush speeds, 10 floss pressures |
| Pressure sensor | Not stated on listing |
| Timer | 2-minute timer, 30-second pacer |
| Battery (brand figure) | Charges in the base |
| Charging | Countertop base with 16 oz reservoir |
| Travel case | Brush travel case |
| App | No |
| ADA Seal | Waterpik flossers carry the ADA Seal |
| Brush heads | Sonic-Fusion flossing heads (compact and full size in the box) |
| Warranty | 3 years |
| Status | Current (SF-04 Professional) |
| Model number (US listing) | SF-04CD012-4 |
| Amazon US check | Sold by Amazon.com (Oct 30, 2026) |
In the box
The listing we track (ASIN B08WSR5XR5, model SF-04CD012-4, black) is the Sonic-Fusion 2.0 Professional, sold by Amazon.com for about $180 on October 30, 2026. It includes the base with a 16 oz removable reservoir, the handle, two flossing brush heads (one compact, one full size), two head covers, a toothbrush travel case and a magnetic post to store heads. The base works on any voltage, which matters if you move abroad.
Three modes, two speeds, ten pressures
Brush, Floss, or Brush + Floss, chosen with a button on the handle. The brush has two speeds, the flosser has ten pressure settings, and one tank gives about 60 seconds of flossing. The brush has a two-minute timer with a 30-second pacer. Start the flosser on its lowest setting for the first week; your gums will bleed a little at first and then settle.
How to use it without spraying the mirror
Lean over the sink, put the head in your mouth before you switch to floss mode, and close your lips enough to stop splashing while letting the water drain out. Guide the tip along the gumline, pausing briefly between teeth. Most people need three or four tries before it stops being messy.
Warranty and support
Waterpik backs the Sonic-Fusion with a three-year limited warranty, a year longer than Oral-B and Philips give on their brushes, and its support team is based in Colorado.
What it costs to run
Replacement Sonic-Fusion heads were about $12.49 each on Amazon US. With two heads in the box, three years come to roughly $305. That’s more than a mid-range brush plus a separate water flosser would cost, so pay for the Sonic-Fusion only if having one device is what gets you flossing.
The alternative: separate devices
If you have counter space, a regular brush plus a countertop flosser does a more thorough job of each. Waterpik’s own Sensonic Complete Care (about $200) pairs a full flosser base with a separate sonic brush. Our brush and water flosser guide compares the two.
As a plain toothbrush
Switch the flosser off and the Sonic-Fusion is a capable sonic brush with two speeds and a 30-second pacer. The heads are a little bulkier than a standard Sonicare head because the floss tip runs through the middle, so people with small mouths sometimes find the back molars awkward. If brushing is all you’ll use, a $50 Sonicare 4100 does it with a smaller head.
Who should look elsewhere
People with small bathrooms, because the base and tank need a permanent spot by an outlet. Frequent travellers who floss, because the flosser stays at home. And anyone who already flosses with string every day: the Sonic-Fusion won’t do much more for you than a good brush and the habit you already have.
A smart device for a specific problem. If between-teeth cleaning is the thing you skip, it can make a bigger difference to your gums than any upgrade in brushing. If you already floss, it’s an expensive way to buy what you have.
The near misses
Same day, same listings, same arithmetic as the Sonic-Fusion 2.0. Gains first, then what you lose.
Waterpik Sensonic Complete Care
about $200 on Oct 30, 2026
- $20 dearer up front
Philips Sonicare 7300
about $140 on Oct 30, 2026
- $40 cheaper up front
- about $37 less over three years
- adds a pressure warning
Oral-B iO Series 3
about $110 on Oct 30, 2026
- $70 cheaper up front
- about $93 less over three years
- heads cost $2.29 less each
I have crowns, veneers or implants. Is a powered brush safe?
Yes, with a soft or sensitive head on a gentle setting. What damages dental work is an abrasive whitening head worked hard along the margin, not the motor.
What we checkedWhitening heads carry a polishing cup and stiffer bristles. Sensitive and gum care heads in the same packs do not.
Our pick for thisPhilips Sonicare 5900Price
How much will the replacement heads cost me?
Roughly $30 to $60 a year per person at four heads a year, which over three years usually beats what you paid for the handle. Price the heads before you pick the brush, not after.
What we checkedGenuine heads we priced on Amazon US on October 30 ran from about $2.49 each (Aquasonic, eight in a box) to about $18.46 each (Quip Rev).
Our pick for thisAquasonic Black SeriesPrice
Odds and ends worth knowing
Yes. The water flossing makes cleaning under wires much easier than threading floss.
Can the Sonic-Fusion replace flossing?
Water flossing is an accepted alternative to string floss for many people. Ask your dentist what’s best for your teeth.
Is it a good toothbrush on its own?
It’s a capable sonic brush, but you’re paying mostly for the flosser.
Can I take the Sonic-Fusion travelling?
The handle travels in its case, but the flosser needs the base and its water tank. On a trip it works as a normal electric toothbrush.
How long does one tank of water last?
About 60 seconds of flossing, which is enough for one full session.
