Poorly designed app for great toothbrush
App is horrendous. Bad UI, obvious functions are not supported - i.e. what happens when couple is using same handle and change toothbrush - app doesn't allow for multiple users or selection/correction of input. But what's more frustrating is that it constantly fails to register what it is build for - coverage, simply after brushing is finished, even though diagram shows full coverage it looses progress and shows 0% coverage on summary page. Waste of time.