What do you do for them to break so soon?
I've had two electric toothbrushes in my life. The first one lasted for maybe 10 years. The breaking point was plastic degradation which occluded the internal electronics and destroyed de button to turn it on.
I think could have been repaired with the right materials. The repairability of the brand I buy is pretty good.
For anyone curious the brand is:
::: spoiler Tap for spoiler
Oral b
:::
The electric toothbrushes are nice but the head replacements are too expensive and I've not find a suitable offbrand replacement. So I end up boiling the toothbrush heads several times to extend their lifetime.