My little Fini has the most horrible stinky breath!!! We adopted him in August from a shelter, it wasn't bad at all. The past couple weeks, its been terrible! He has been seen by the vet at the shelter, for his neuter, general check up and vaccinations and then I had him checked by our own vet. He is eating fine, actually he is a little pig and I worry he will end up over weight if I don't keep an eye on it when he is older. He is currently about 6 months. Could teething cause this rotten breath? It is nasty ,when he plays and chews on my other cat, her fur smells...YUCK! I picked him up for a cuddle this morning and one of his little teeth fell out on me. I checked his gums and I could see the tiny spot with a little blood on it, and sure enough on the other side, it looks like he recently lost one there. I hope when this teething business is over , the stinky breath leaves with it. He seems healthy enough, playing and running like a lunatic He has a beautiful shiny coat and is growing like crazy. Has anyone else experienced yucky kitten breath? He is my 5th cat,but only 3rd kitten and I never noticed it on the other two.