Oh... Well rather than use my google machine I'll assume that is a disease/condition/disorder and say I did not know that. But thinking about it, didn't he have teeth in season 2? I thought I remembered thinking "Oh his teeth grew in over the last year" when I was watching season 2. Maybe he got fake teeth and i just wan't paying attention when it was explained. I wasn't really into S2 and felt it should have ended with the first season.