I had a bunny nemed Hyzenthlay whose teeth grew straight out to the sides! She had to have her pellets moistened before they were fed to her (obviously they had to be changed frequently) and she had her teeth trimmed about once every six weeks. Piper will be all right, and his teeth will soon be a nice healthy length again!

Edit: Hyzie is a good example of why people who don't know the history of their animals shouldn't breed them. She was the result of a pet-store cross.