hedgehogs teeth don't grow as other rodents do. Theirs are more like dog teeth, have you ever seen them? lol, when I first got Splinter, it was the first time I had seen a hedgie's teeth (her lower jaw is way shorter than her top one, so I can see her 2 front teeth)
As for treats, I have not yet found any that Splinter likes, but you could try yogurt dips, any type of rabbit treats, and I have found hedgie treats in some places. As for crickets and worms, those should really be a good part of their diet. Cat food is good too, but the extra nutrition that they get from crickets and worms is very very good too.

I hope that this helped!!
Steph and Splinter