Our Fister had a really bad breath, but after we took him to the vet and got his teeth cleaned, it dissapeared completely. He had to have two out - one was loose already, after a fight with another cat and the rest needed a good cleaning. Our vet used utra sound (is that what it's called in english?) and we got him back with shining white teeth - ready for a toothpaste commercial! He was under anesthesia of course, but the vet gave him a smaller dose because it was his first time there - and it worked sufficiently!

We're now feeding him dry food mostly and that helps to keep his teeth in a good condition.