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Once they get overgrown they will need trimming as nothing will really shorten them but as preventative measures go there are few things that can help, the sand bath should help, you can use small terracotta flower pots laid on the side in the cage, put a little substrate in & hide food or the occasional treat in there so she will dig around in it, tiles either granite or ordinary kitchen tiles laid upside down in an area where she will walk over it frequently can help a bit too.