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Oral-B iO Series 9 long-term review: the top class toothbrush

Oral-B iO Series 9 test
Image: © 2021 TechnikNews
(Post picture: © 2021 © 2021 TechnikNews)

Electric toothbrushes have been establishing themselves more and more in our company for a number of years. Dentists are also increasingly leaving manual toothbrushes on the shelf. With the Oral-B iO Series 9N you want to offer something more than a normal electric toothbrush. In this test, we clarify whether the purchase is worthwhile.

In this long-term test, I will bring my experiences of the last few months in daily use of the iO Series 9 to text. Through this long-term test, I was able to get enough opinions from dentists, and the brush head had to be replaced during the months of the test. So what can Oral-B's flagship toothbrushes do? Let's put it this way - with the relatively high EIA, you don't necessarily set the bar low. We got the best possible out of the Oral-B iO Series 9 review.


The high-end toothbrush from Oral-B comes in a packaging that already gives an idea of ​​most of the details from the outside. The scope of delivery includes a charging station, a travel case including a charging cable, an "ultimate cleaning" brush head, a storage option for two brush heads and the handpiece, i.e. the toothbrush itself. The buyer can choose from Black Onyx, White Alabaster and Rose Quartz as color variants . In the meantime, the price has also dropped significantly, from just under 400 euros to around 200 euros. So it is now all the more worthwhile to take a closer look at the toothbrush.

Set up

Thanks to the built-in Bluetooth, you can already guess that the toothbrush works with an app. Of course, it can also be operated in standalone mode without an app. However, the visual display during cleaning and the cleaning feedback is dispensed with. We'll go into all of the functions in more detail in this review below. If you pick up the toothbrush, you will always be greeted in a friendly manner on the display with a “Hello”, “Good morning” or “Good evening”.

After switching on for the first time, in addition to selecting the language, the preferred color of the light ring is set up. You can then continue directly with the start in the app. Bluetooth is active on the toothbrush by default, but can be deactivated in the settings. A new device can also be paired from there. A software update is usually due during the initial setup - yes, toothbrushes will also receive updates in 2021 - but this is done in less than two minutes.

Then you can get started - an introduction to the app quickly shows all the functions that are possible in connection with the smartphone.


Imprint control

Too much pressure when brushing is bad for the gums. If the pressure is too low, the teeth will not be cleaned thoroughly. The optimal pressure is even more important with an electric toothbrush due to the self-rotating bristles compared to a manual toothbrush. While most electric toothbrushes have this feature, they only alert you to excessive pressure. Oral-B's iO Series 9 comes with a total of three displays. The LED ring lights up either neutrally (too little pressure), green (optimal pressure) or red (too much pressure).

Oral-B iO Series 9 brush head

Various brush heads are available for the Series 9. (Image: © 2021 TechnikNews)

In the case of sensitive gums, even this “optimal pressure” can be too much. Here you can either use the "Sensitive Clean" brushes or simply choose the right pressure yourself. Incidentally, this optimal pressure cannot be set in the toothbrush settings.


The color display on the front is used to select the cleaning modes, display the timer and offers a few basic settings. The charge status is also displayed after each cleaning process.

Cleaning modes

A total of seven cleaning modes are available with the iO Series 9. With the predecessor (iO 8) there were fewer. The user can choose between "Daily Clean", "Sensitive", "Whiten", "Gum Care", "Intense", "Super Sensitive" and "Tongue Clean". The display order can be adjusted in the app. For normal use, "Daily Clean" is recommended, for gumsprothe sensitive modes and tooth discoloration or more thorough cleaning the "Whiten" or "Intense" modes. A more detailed explanation of the modes in the app would still be a point of improvement.

Basically, however, it can be said that the “Whiten” and “Intense” modes feel more cleaned than in the other modes. Also means that these are not recommended for everyday use, as they can quickly offend the gums. For those with braces or sensitive gums, the sensitive modes ensure a pleasant cleaning experience.

Cleaning tracking

The highlight of the Oral-B electric toothbrush. If you couple the toothbrush with the app from the store, you get a visual view of the surfaces to be cleaned in the mouth. The expression "3D tooth surface tracking" used by the manufacturer may sound a bit confusing - no, the display is not personalized. For example, if you have more or fewer teeth than usual, they will not be shown.

In the test, the tracking of the current cleaning position in the mouth mostly worked well. In some cases, however, cleaning was done in the top left, then the cleaning process was displayed in the top right. These smaller ones ProHowever, a few updates have more or less got the problem under control. Due to a bug, however, the timer often did not start on time, which, interestingly enough, the app even recognized itself. The message was displayed that full coverage may not be achieved due to missing recording.

Even if after a while you start the app less often while cleaning and thus do not use the tracking, it makes you aware of where you tend to forget to clean. A good tip from dentists is to always stick to the KAI method (chewing surfaces first, then outer surfaces and finally the inner surfaces).


With app

Price: Free of charge
Developer: P&G Health Care
Price: Free of charge

How brushing your teeth basically works should be clear. If not, the Oral-B iO Series 9 can also support you here. Activate Bluetooth on the smartphone, start the app, select the cleaning mode on the toothbrush, press the start button and the timer should start in the app. With cleaning tracking, the toothbrush recognizes by itself which area of ​​the mouth you are currently in and whether you are brushing on the chewing surface, outside or inside. If all lines have disappeared and all teeth are shiny, you have successfully cleaned all areas. Then simply switch off the toothbrush and the app should then display the score 100/100. If not, there is feedback and motivation to improve.

Without app

If you want to brush your teeth without the app, that is also possible. Then, however, only the imprint control and a timer are available on the display. In addition, the handpiece vibrates every 30 seconds - an indicator that the cleaning area needs to be changed. It should then take a maximum of two minutes to clean four areas (top left, top right, bottom left and bottom right). This is the brushing time recommended by Oral-B. In addition, most dentists consider two minutes to be the optimal cleaning time for electric toothbrushes.

cleaning sensation

Admittedly, I might be a bit biased when it comes to Oral-B: So far, I've also brushed with an Oral-B electric toothbrush. My old model lasted for years, but back then it didn't offer any extra functions such as a print control, let alone an app. After switching to the OK toothbrush, my teeth felt much cleaner after every brushing process. Not only was this a subjective feeling, my dentist was also able to confirm the improvement after a few months of use compared to before. The new magnetic drive of the brush head, which is only used in the iO series, should be to blame and allow more vibrations than ever before, according to the manufacturer.


The battery life in my test was around 14 days, sometimes even a little more. My brushing times were twice a day for two to three minutes. After each brushing process, the charge level is displayed directly on the toothbrush Prospecified. However, this display does not seem to be fully developed yet, so the battery level remains at 100 a few times at the beginning Prostand and fall when reaching 50-Procent brand faster and faster. A more even display would have been desirable here.

Oral-B iO Series 9 charging station

The charging station makes a good impression in the bathroom. (Image: © 2021 TechnikNews)


At a price of 400 euros - even if the toothbrush performs well, the cleaning performance is excellent and the functions offered work well in most cases - the Oral-B iO Series 9 would have been difficult to recommend. After all, we're talking about “just” a toothbrush. This price is simply too high even for a premium toothbrush. The price of the iO Series 9 is currently loud Price Comparison at around 200 euros. This price is completely okay in my opinion. Sure, even if this price may still seem high, you don't get an ordinary electric toothbrush here, but are definitely in the top class. Those who value extra functions such as an app, a pleasant cleaning experience and great accessories will also be happy to spend their money here.

But there is still room for improvement in the premier class: You should consider, for example, that the brush heads previously used in the iO series no longer work because they are now driven magnetically and no longer mechanically. In addition, while ten brush heads cost around 15-20 euros for the old models, two for the iO series cost the same. The cleaning detection also did not work accurately in some cases - but after a while you have the knack of how to hold the handpiece so that it works as well as possible.

Thanks to Oral-B for providing the test device!

Buy Oral-B iO Series 9

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David Wurm

Do that TechnikNews-Ding together with a great team since 2015. Works in the background on the server infrastructure and is also responsible for everything editorial. Is fascinated by current technology and enjoys blogging about everything digital. In his free time he can often be found developing webs, taking photographs or making radio.

David has already written 962 articles and left 382 comments.

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