Oral-B iO Series 9 Review

The Oral-B iO Series 9 soared through all of our tests with relative ease, with very few drawbacks. However, the sticker shock is undeniable, making the price a considerable factor. If you can overlook that, you'll be treated to a top-of-the-line electric toothbrush that can dramatically enhance your overall dental hygiene. Plus, for those who appreciate analytical data, it adds a touch of fun to your oral care routine.

The Oral-B iO Series 10 has been released. Overall, we think the series 10 is a little better for its comfort and ease of use. However, we found the cleaning performance is very similar. If cleaning performance is the most important to you, and you want to save money, we still recommend the Series 9. The Series 10 is a hair lighter. Both have similar annual brush head costs.

Tested and Rated

We don't just research toothbrushes; we buy them at retail (like you) and then have our expert reviewers spend hundreds of hours testing them side-by-side using a variety of plaque and stain tests. Gena Bradshaw has now tested nearly 100 toothbrushes and provides me, Ryan White, the data to write the review below.

Performance Comparison

Cleaning

Our comprehensive testing involved a variety of methods, including having our skilled testers chew a plaque dispensing tablet to highlight plaque with a pink tone. This allowed us to properly gauge how effectively the electric toothbrush cleaned off plaque during the recommended two-minute cleaning session. Both before and after brushing photos were taken. However, prior to our testers visually assessing the results, they were prompted to report the cleanliness they felt after using each brush.

The Oral-B excelled in this metric, providing an overwhelmingly clean feeling and obliterating all visible plaque. To ensure thorough testing, an artificial dental model was used as well. Coffee grounds and pesto were spread across the teeth and gums, and our testers used the device for one minute to evaluate the efficiency of the brush. Again, the brush succeeded in clearing out all visible debris.

Comfort

To guarantee utmost comfort, I thoroughly tested each brush, scrutinizing every mode and ensuring none of the devices registered too loudly on our decibel reader.

This brush provides a comfortable user experience with seven diverse modes to suit various preferences. From super-sensitive to intense and gum care to tongue cleaning, each setting offers a unique intensity and rotation pattern to accommodate a wide range of users. While the handle may feel a bit heavy, it remains comfortable to grip. Our testers discovered that even the most intense setting was not overly powerful, but individuals with sensitive gums should exercise caution. The handle features an indicator ring around its neck that changes colors to convey intensity levels—green for optimal, red for excessive pressure, and white for insufficient pressure. This feature is essential for proper comfort and cleaning effectiveness.

While most electric toothbrushes emit a motorized sound, it might not be a significant concern for some. However, a device used multiple times a day should seamlessly fade into the background and not dominate the sound stage in your bathroom. Additionally, the pitch of each device is crucial because, though some may be quiet, they may produce a less-than-ideal hum. The Oral-B to give off a pleasant enough sound, and it wasn't too loud, registering a maximum of 73 decibels when our decibel reader was 3 inches away.

Finally, I encountered a flaw in an otherwise nearly perfect device: the holes in the brush head. Regrettably, this appears to be a persistent issue across various Oral-B models. Essentially, these holes allow a mixture of toothpaste and saliva to leak while brushing, which, from a comfort standpoint, is not particularly enjoyable. While the device is water-resistant, allowing you to use it in the shower to mitigate this issue, it's not an ideal solution either.

Ease of Use

While ease of use may not be our most critical metric, it still contributes 20% to the final review score. I assess this aspect by testing each mode offered by the electric toothbrushes, evaluating the simplicity of swapping between modes and indicators of the active mode. Additionally, I examine the ease of cleaning for each brush and verify if the device includes a built-in two-minute timer.

The bottom button on the Oral-B iO Series 9 offers a convenient way to switch between brush modes or adjust the LED ring light color to suit your preference. This high-tech device offers seven modes: Daily Clean, Sensitive, Whiten, Gum Care, Intense, Super Sensitive, and Tongue Clean. It sounds like a lot (and it is!) but most folks will find themselves only needing a couple of these modes. An added convenience is the ability to switch between settings even when the brush head is powered off — a feature I appreciated. Moreover, the device remembers your last used mode, defaulting to it the next time you power it on. The crisp fonts are easy to read on the digital screen, and it even greets you with a 'good morning' and a smiley emoji. Each subsequent mode has a unique icon and label, too. These little touches add to the depth and fun of this device without sacrificing its user-friendliness.

Thankfully, the iO Series 9 includes a handy two-minute timer that is displayed on the digital screen and counts down in real-time. Once the two minutes have passed, the screen displays a smiley face with star eyes. If you turn the brush off before the two minutes, you'll notice a sad face. All in all, these are useful features that enhance the overall experience. While I appreciate the inclusion of a two-minute timer, I wish the brush would automatically shut off at the end of this period or offer a customizable setting for users who prefer it. Currently, the brush continues running beyond the two minutes. All of this brushing data can be viewed from its mobile app. Additional brush heads can be ordered here as well.

As highlighted in our comfort section, the issue with holes in the brush head also impacts the ease of use metric. This flaw not only creates a bit of a mess during brushing but also adds to the maintenance routine. Residual toothpaste and saliva can seep into the brush handle, and while the device is water-resistant, regular cleaning is essential to prevent unpleasant build-up.

Battery Life

To get an accurate representation of the battery life, I ran each brush twice a day for a total of four minutes (two minutes each time) to simulate typical daily use. Additionally, I sought features that would allow us to determine if the battery was running low easily.

The Oral-B iO Series 9 goes the extra mile with its continuous battery charge indicator displayed prominently on the screen, offering a precise readout down to the exact percentage. As an added visual cue, the LED light encircling the neck illuminates in a vibrant red hue, signaling a low battery level. I got 38.5 days of life out of the Oral-B, which is impressive. Once fully depleted, it only takes 3 hours to charge up to full capacity. The travel case that comes with this model doubles as a charger as well, so unless you're away from power for long periods of time, it should last more than long enough for travel. Yet another feather in the cap of an already solid device.

Should You Buy the Oral-B iO Series 9?

If you're considering this model as an investment in your dental health, rest assured you won't be disappointed. While it's a steep price, it's justified if you have the means to invest in it. The extended battery life, travel case, and excellent cleaning performance take this toothbrush to the next level. I confidently give the Series 9 my full recommendation.

What Other Electric Toothbrush Should You Consider?