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October 2026

Inside the Dyson CameraJet: How a $500 Toothbrush Sees, Thinks, and Fires

In this Article:

  • A camera guides every shot, capturing 28 images per second while machine learning identifies gaps between teeth and triggers a targeted jet within 100 milliseconds.
  • An anti-gravity tank, diaphragm pump, and pressure chamber work together to deliver mouthwash as the toothbrush moves and tilts.
  • Complexity comes with trade-offs. CT scans reveal how Dyson packed a camera, fluid system, motor, and battery into one handle—and how the reliability of the entire product depends on every component working together.
  • 10.23.2026

    Editor’s note: This is Part 2 of our investigation into the Dyson CameraJet. Part 1 covers how our unit failed.

    In Part 1 of this series, I traced the Dyson CameraJet’s failure to a 0.4 mm tear in its jet tube. That tube sits just above the electronics that run the whole toothbrush, and it’s part of the CameraJet’s most ambitious feature: finding the gaps between your teeth and firing mouthwash into them.

    The 0.4 mm tear in the CameraJet’s jet tube, where it joins its fitting

    Dyson spent six years and the effort of 661 engineers to develop this unique toothbrush. Using Lumafield industrial CT scans, we’re able to walk through this remarkable toothbrush to see how it all works.

    A camera inside the brush head

    The most unusual part of the CameraJet is a 100,000-pixel macro camera with strobing lights, sitting just below the brush head. The camera lens itself is about a millimeter across.

    The camera sits just below the brush head along with its sensor, lenses, and LEDs.

    The camera informs Dyson’s Gap Optical Targeting system, which scans 28 images per second to find the spaces between teeth in real time.

    A camera and foaming toothpaste aren’t a great mix. Dyson’s answer was to build the rest of the system around the camera, and to pair the toothbrush with a proprietary non-foaming toothpaste and mouth rinse. Some owners have reported condensation fogging the lens, which cuts down on how often the jet fires.

    Deciding when to fire

    Dyson’s machine learning algorithm identifies, tracks, and predicts the gaps between teeth, and triggers the jet within 100 milliseconds of the camera seeing one. 

    The jet’s shape got as much attention as its timing. Most water flossers use a needle-shaped stream, which Dyson says pierces plaque without removing it effectively. They went with a conical jet shape which spreads the liquid across a wider area so it can remove plaque at a lower pressure. To test it, the company spent five years working with the Faculty of Dentistry at the National University of Singapore to develop a proxy plaque, which let engineers try new jet designs without running a clinical trial each time.

    Keeping the liquid moving

    The liquid of choice is held in a 12.5 ml tank at the top of the handle, sized for a single cleaning session. The hard part is keeping it usable at any angle. Conventional flossers rely on a “straw in a cup” design, which draws in air and loses performance when tilted. Dyson’s answer to this is what it calls an anti-gravity tank, paired with a diaphragm pump and pressure chamber that they say will adapt as you brush so the jet can still fire.

    The brush motor sits inside the anti-gravity tank, surrounded by water.

    Refilling happens at the dock. The charging base holds a 200 ml reservoir, and with the brush docked, a press of a button refills the handle in about three seconds. In my testing, the button triggers a refill whether or not the toothbrush is in the dock.

    Brushing, power, and charging

    The brush heads use RFID and the toothbrush counts how many times they’ve been used. Both the lithium-ion battery and the brush head are replaceable.

    The brush connects over Bluetooth to the MyDyson app, which offers live camera viewing, guided cleaning, coverage mapping, and brushing feedback.

    The battery charges through metal contacts on the handle, and some owners have reported residue building up on them after mouthwash ran down the back of the brush.

    The replaceable cylindrical lithium-ion battery cell and exposed charging contacts

    Everything in one handle

    Putting all of this functionality in one handle is what makes the CameraJet possible, but it also creates more ways for it to fail. A replaceable battery and exposed charging contacts are convenient, but each one is another potential location of failure.

    From top to bottom: the camera, the anti-gravity tank, the diaphragm pump, and the battery.

    What the camera demanded

    The camera gets all the attention, but nearly everything else in the handle exists to serve it: a toothpaste that doesn’t foam, a jet shaped to work at low pressure and a tank that works upside down. Each one solves a problem the camera created and each one has to survive twice-daily brushing. The features can be designed in a lab, but the product only works if every one of those parts holds up together.

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