The brush looks and feels great. However, no matter all the different troubleshooting methods I try, the brush will not connect to the app. Very disappointed.

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.

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!

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.

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 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.

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!

Motion sensor on toothbrush will continuously drain the battery when the toothbrush moves around in case or bag. Any slight movement will turn on display. Must charge DAILY which is very inconvenient for traveler.

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?

Best brush I've ever had! Why have I waited so long to use this type of toothbrush. I'm glad i made the switch and I will buy one for my entire family!