I recall reading on here somewhere that white teeth are a sign of a health problem. I just noticed Zen's teeth are white, whereas they previously were orange like the other rats'. I can't find the info, but can someone please help me? He turned 2 in February, and he's on several meds to maintain his chronic respiratory inflammation (doxy, prednisone, aminophylline). His xrays look pretty good, and he's active and happy, but he has been dropping weight since his breathing problems started. He is getting Ensure three times a day, a few spoons each time, to try keeping weight on.