My second one also broke again after almost 2 years... I took the liberty of taking the appliance apart this time. The fault was the same for both - the toothbrush didn't react to anything.
When I opened the housing, it quickly became clear that water damage was the cause.
Now at least I can use the "battery" as a rechargeable battery ;)
Make sure you buy the warranty extension!

I can only confirm this. Three of mine broke after 2-2.5 years each. (Always the same problem.)

Unfortunately, when certain parts are defective, repair is so time-consuming and expensive that a new device is the easier way. Of course, we understand the displeasure about such a procedure. We also experience this time and again in warranty/defect cases.

What appliance or machine part is still built today that can be repaired?