Animals seem to do well enough. Sure there is the occasional issue. But it seems pretty clear the modern diet is the significant factor.
Our 'modern' diet of heavy carbs is thousands of years old by now though
I agree..?
We have wisdom teeth as a natural backup for losing a few; other animals have similar strategies, though details vary.
What is different is that we cook — evolution still hasn't fully caught up with that, though it does seem to have resulted in our mouths being too small for all the teeth.