[IKrines]

Carrots can be used as chew, just not too often as it is like eating candy for them. Same can be said about those honeyglazed rodnet seed sticks you can buy, carrots is better.
Fresh aple branches with leaves, by my experience all rodnets I had in the past, liked bark of fresh brenches, but would let the wood be untouch. Millet strands youcan buy for birds would also keep the teeth too.