How do I distinguish between normal cat bad breath, and need-to-see-a-vet bad breath?

bad breath
Do your own thinking! asked:

We have a cat with bad breath, but — well, our cat’s breath smells like cat food, really.

She eats good quality food and some dental/breath treats, but — still not great. I haven’t had cats for very long, so figuring out how bad is bad for a cat, if that follows, isn’t easy. Would there be a sort of decaying odour if there were dental problems involved?

She is not the sort of docile thing who’ll easily submit to a tooth brushing, too…
She just yawned on me. ‘garbage’ is the best description I can think of for the smell. Poor kitty…

Get Rid of Poop Breath