Our Millie is aggressive too. She's been that way since she was a baby. We find that giving her more toys helps (so more stuffed animals, especially those with catnip - catnip wears them out after playing a while.) You could have her incisors filed down - I've been told others have done this. Your vet will likely want to use anesthesia as if it were a regular dental, so be prepared for risks in case, but this may be a viable option.