On February 15, Oral-B bricked the Guide’s ability to set up Alexa by discontinuing the Oral-B Connect app required to complete the process. The Oral-B Guide still has Alexa built-in and customers can keep using the Alexa experience on devices that were set up through the Oral-B Connect app. Oral-B discontinued the Guide about two years ago and now only has one mobile app, called Oral-B. If a toothbrush brand is going to have any apps at all, one seems like the maximum reasonable number.

Source: Oral-B bricking Alexa toothbrush is cautionary tale against buzzy tech

Anything that needs an app to work will eventually be abandoned and cease to work in some way