Very good toothbrush. I got it because my dentist recommended that I get an Oral B IO. The size of the head is a bit larger than the classic Oral B ones (i.e., all those that are not IO), which personally suited me very well as it covers the entire surface of the teeth. It makes less noise than the Oral B Genius, for example. I had the Sonicare Diamond Clean for the last few years and I can say that I like the Oral B IO much more. It took me days to get used to the Sonicare as it tickled me at first; I also feel that the Oral B IO doesn't make as much noise and I prefer the sensation I have during cleaning. Finally, it cleans much better, especially between the teeth, and for me personally, it is easier to use. So far, I mainly use the gentle care head, which I believe is the best option, especially for beginners. The app is good but not perfect; sometimes it takes a little while to understand where in the mouth you are. I can say that the pressure sensor has helped me a lot, as it shows you when you are applying the right pressure and when you are applying less or more than you should. I am generally excited about how clean it feels; those who say it feels a bit like having a cleaning at the dentist are right.

Guys, I know some of you might get upset with my experience on the product but I have to say the following.
I was obsessed with getting the iO Series 9 and a friend of mine has the iO Series 3 and told me it's not worth spending 150+ euros because it's exactly the same motor (same power), you just pay for:
- The +4 extra cleaning functions.
- The support of the app (which is essentially useless and a headache to monitor the brushing progress - since someone who already had an electric toothbrush knows the process)
- The magnetic charging that charges in 2-3 hours instead of 13 hours (which doesn't help as the battery life in both is about 2 weeks with 1 to 2 minutes a day).
And some say that the motor is more powerful in the "big series" (Series 8, 9, 10) which is NOT true and companies probably make some people say that.
It's all about marketing. Initially, the model 9 was launched (in 2020). But because people don't buy into it, the company started removing features and reducing the price on new models (more budget-friendly) to boost sales.
I personally got influenced by a video on YouTube showing the motor power difference between an Oral-B (not iO - costing 20-30€) and an iO Series 9. (They didn't compare it to, for example, an iO Series 3, 4, or 5, logical... to sell more iO Series 9). They make people 1000% influence the world to sell trashy characteristics.
Pure theft.
I recommend readers to go for iO Series 3 or 5.
- I recommend iO 3 IF you don't want to use the brushing monitoring app.
- I recommend iO 5 IF you want to use the brushing monitoring app.
(because the tracking feature via the app is supported by iO 5 and above models (5, 6, 7, 8, 9, and 10).
Even in the comparison iO 5 vs iO 6 there is NO difference. The LED screen changes and the Super Sensitive setting translates to Gum Care. We're talking about marketing trickery.
Not to mention the extra +2 functions in the 9 and 10 models. (Compared to 5, 6, 7, and 8).
The difference between iO 8 and iO 9 is the +1 extra function for tongue cleaning (you pay +30€) which you can do tongue cleaning with a switched-off toothbrush or even with the gentlest function (the initial theft).
Quality/price ratio = 1/5 (I wish I could give it 0/5 in this rating - everything else is 5/5)
Value your money and don't throw it away so easily. Shame.
I hope I helped.
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A guy in the comments asks:
"...210 euros for two and 170 for one. why this difference?..."
So you understand that I didn't struggle for nothing to write my experience to maybe save someone's day!
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Another person said in their review:
"... and I challenge you to find out. I made a purchase at a store at a very low price and as soon as I went to unbox it, I found out that the package had 2 round transparent stickers on the right and 2 on the left. and on both sides, the first sticker of the 2 was torn (meaning the package had been opened) and on top, the second sealed sticker was stuck. Draw your own conclusions."

So our poet tells us that if we get it at a low price, it will be opened. The poet is right, unfortunately! I am attaching a photo for you. The purchase was made for 160€ about a month ago, and because I always keep photos of the products I buy for future reviews (before opening them), I decided to zoom in on the problematic area and upload it.

I have been using Oral B electric toothbrushes for two decades. From the Vitality to the SMART 5000, 7000, and most recently the Genius X. In my opinion, the IO generation represents the greatest advancement among all the series I mentioned. The feeling I get when I use it is that it works very differently from previous generations. It seems to rely more on vibration rather than rotation compared to the previous ones. It appears to clean better and deeper. For those who do not want the extra features of the IO9, you can easily get the same result with the IO6. Its price is very high even now that it has been significantly reduced compared to the original. I hope it lasts longer than the Genius X, which stopped working after just three years of use. Its autonomy is close to the promised two weeks. Its construction is sturdy and its finish is simply good, without being particularly luxurious. It comes with only one replacement brush head, something that in the past was unthinkable even for cheaper devices.

Update 2025: About a year after use, the toothbrush started shutting off and its battery would drain even though the device was charged between 60-90%. It took two visits to different company service centers (the first informed me that the device was working normally!) for the problem to be recognized and the device to be replaced.

I start with what everyone needs to know about the 9N series, and I challenge you to find out for yourselves. I made a purchase at a store at a fairly low price, and as soon as I went to unpack it, I found that the packaging had 2 round transparent stickers on the right and 2 on the left. And on both sides, the first sticker out of the 2 was torn (meaning the packaging had been opened), and the second sticker was sealed on top. Draw your own conclusions. So, I went to 3 other stores that offer quite low prices and found exactly the same thing with 5 packages. Even the employees didn't know about it and were surprised. Then I went to a large well-known chain store that had the toothbrush at a much higher price than usual, and I found 1 round sticker on the right and 1 on the left without any signs of tampering. There was no second sticker above the first one. I can't know why this happens, I leave it to your judgment. Now, regarding the device and comparing it to the previous toothbrush, the vitality, I noticed a huge difference. Much less noise, excellent speed, and cleaning of the brush head, and the accessories are very good, as with the travel case, you don't need to take the base. It charges from the case! I haven't tried the Bluetooth yet. Perhaps the only downside is that the size of the device is a bit bulkier than I would like. If someone can't afford to spend so much money or doesn't want the extra features that don't really differentiate the device much, they just need to get the 6 or 7 series, which are a good value for money.