How come you have to crush his food? Have you had his teeth checked by a vet?
I wouldn't bother with any supplements like that, a good balanced mix plus fresh veggies is plenty.
I've yet to have a hamster that chews on wood but found that things like these are very good for keeping their teeth in tip top condition -
Boredom Breakers NATURALS Carrot Woodroll Treat Chew- Rabbit Guinea Pig Rat | eBay