look in her mouth and see what is going on in there and see if you can see anything wrong. Cats are done teething at around 6 months old. I remember Spaz started gnawing on things(now ex-husband found her chewing on the plugged in cord on the clock radio) and I immediately check her mouth and sure enough she was teething, but she was teething age. Look in her mouth that might tell you if she has any dental issues.