Yes, that is the first thing I thought to. It does seem to have a swollen look to it. I did not notice this yesterday, and I did feed him last night. So a broken tooth maybe probable? I was not able to open his mouth to look better before I had to get to work, plus I was not sure if I should break the general rule about handling after eating or still stick to it. Since I just fed him last night, should I still wait to be man handling him to look into his mouth, or would this be a case where you would break the rules and check his mouth immediately?