
Amy Venier
Positional awareness of the iO is poor. The area I'm brushing isn't the area shown whitening in the app, so I finish with "67%, incomplete coverage" because it never realizes that I covered that spot. Apparently starting in the back isn't supported, only starting front and center. I do find the app more intuitive for changing light colors, language, and favorite mode.
P&G Health Care
October 31, 2025
We are disappointed to hear that position detection has not been tracking correctly. To improve your score, we recommend standing straight in front of the mirror and slowly guiding the brush from tooth to tooth. If this does not help, we encourage you to give our team a call at (800) 566-7252 so we are better able to assist you.

Sunčana Zeman
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App is pretty easy to use once you get used to it. Can't add 2 toothbrushes to one device, some people don't own 5 different smart phones /tablets, so even though having 2 or more toothbrushes you can only use one per device. Kids who still don't have all second molars get lower score because there is literally nothing to brush except gums. Or people who maybe miss a few teeth because of medical reasons. Also I live in Germany and app forces me to change my language in my phone to German
7 people found this review helpful

Marcello Pasquale
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One good update, one broken update. Still unable to detect the position in the corners of the mouth, and now introducing new annoying settings active by default. No, I don't want to save the session if I pause after 2 minutes. And stop creating multiple unguided sessions for yesterday's guided session. Nice when it works. Edit: lately, if it works once in 4 usages, it's an achievement. Dropping from 3 to 1 star, since detection has gotten significantly worse (older handle).
21 people found this review helpful
P&G Health Care
August 19, 2025
Marcello, we're sorry to hear the position detection isn't working as expected. To help, start with the outside surface of your teeth, guide the brush slowly from tooth to tooth, and hold the brush head in place for a few seconds against each tooth before moving on to the next. We'd like to help further, and invite you to call us at (800) 566-7252