I was playing with Clover, our fat rat, and I noticed her bottom teeth looking longer than they used to. She still bruxes, and she's eating normally, but it almost looks like her mouth isn't closing all the way. I tried getting a photo, but she's like a child - Perfectly still up until you point a camera at her. There are chew toys in the cage, but they don't appear to ever be used by either she or Pan. Any ideas?