That would be terribly cruel. Maybe try putting a scent they like on the wood, like a small amount of peanut butter, baby food, etc. My girls like it when I hang wooden blocks or beads from the top of the cage, they chew them down and then chew them to bits
Thank you for the replies. I did put peanut butter on their chews and noticed a lot more chewing. And this morning one of them were grinding. I'll have a look to check if their teeth are going down before a vet.