I've got hay and willow and grapevine. I'll see if that helps, and if not I'll get someone to help me trim his teeth. I've been monitoring his weight, and it's staying at his normal level, so I'm not to worried right now.
Haha, see I've never had trouble with my degus and plastic, instead of chewing on these things, my degus would rather collect them and put them in piles around the cage. They have a plastic ladder and cat toy balls that have never been chewed on.
In other piles they have sticks, nut shells, sticks, pumice stones, blankies, cardboard, and food items. One also like to steal things and hide them in places where the other can't get to them, the cheeky brat.