I bought this to replace a competitor's model, and it seems to do a much better job of cleaning teeth and removing plaque. On the downside the app gets confused as to where I am brushing. I see no evidence it monitors 16 zones. More like 6.

Provides very thorough cleaning. My only concern is lack of accessories. The less expensive model, the iO-7 comes with brush head holders, how come the top of the line model, the iO-9 does not?

The ultimate tool, a must have for each tooth you have ! Do not wait , if you do you will slap yourself when you finally do decide to buy the best oral cleaning tool ever!

Received as a gift and couldn't be happier. I call it the "Cadilliac of tooth brushes". I love the blue tooth tutorial and other amenities. A 5-star tooth brush indeed.

I've just started using my Oi toothbrush but for the price paid, I can't believe it doesn't have a little plastic cap to go over the brush head when on the charger.

Splurged on this brush after getting several recommendations from my friends and WOW it’s worth it. Feels like I just left the dentist’s office. The app works well and is very engaging. Really recommend this to anyone, it’s worth it!

I have never felt my teeth so clean even after a cleaning at the dentist. This this is worth every penny. How did I ever live without it. Convincing everyone I know to get one!!

I have been using the iO for a week instead of Sonicare Diamond Clean: the iO has a more refined display, better Bluetooth connectivity, and better cleanings

When I bought this I didn’t realize that it costs way more just cuz you added one thing in so it ended up costing a lot more than just getting the Oral-B iO series 9 Be careful when you use money on this

I have this since 2 weeks ago and it has made a real impact in my life. I no longer need to put so much pressure on my gums, thinking that I am not cleaning enough... The brush does everything and the app couches you!