Talked to one vet and he said brown teeth can come from medicine given to a ferret or food.... The two rescues are 1 and 4 year olds. The one year old has one partially brown tooth. The 4 year old has one totally brown... They were fed Purina Cat Chow.. Not sure how long this was fed. I did read 2 archieves that this food will cause brown teeth. My vet who neutered Rascal today will tell me more on this brown tooth. Just thought this would help others. Since I said, there was hardly anything on brown teeth or tooth in the archieves.. I hope my posts get some people to think since I do post alot.. My higher power helps me alot...Ya know, my friend has an older ferret and she showed me how an older ferret's tooth may look like. All our ferret's are very young. Maybe some of you can get together for play times and compare notes.. If it was not for this list I would not have some ferret friends as friends... Oh, we rarely talk when the ferret's get together,hehehe.. Debbie [Posted in FML issue 2927]