I got Koko's teeth cleaned in Oct., the vet said there were no bad teeth and her gums look fine. She did have some mild tartar build up but that was all. In the past couple of weeks or breath has smelled really rotten. I brush her teeth every other day (we are working up to everyday), and I figured it was the fish food and fish oil caps that were doing it. So today I was inspecting them and her back big teeth smell gosh awful, like a rotten tooth smell. She has an apt today with vet to check it out but is that normal for one to develop so fast?