What s wrong with my cat? Is it serious?

He has a gel-like foam around his mouth and his breath smells really bad (and you can smell it from a few feet away). Sometimes his mouth starts twitching. There have been a few times throughout his life (he s a few years old now) when his breath would stink, but not this bad. He s been to the vet to be neutered... show more He has a gel-like foam around his mouth and his breath smells really bad (and you can smell it from a few feet away). Sometimes his mouth starts twitching. There have been a few times throughout his life (he s a few years old now) when his breath would stink, but not this bad. He s been to the vet to be neutered in the last year and everything else seemed to check out.
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