My kitty is dripping

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Chelsea appears to be having a leakage problem, dripping what looks like saliva from her mouth (could also be a runny nose, but careful investigation of the drips suggests mouth). She doesn't seem to be bothered by it, though, just going about her regular kitty business. It's never been a problem before, and I only just noticed it today. I tried calling the vet, but they're closed already. Google searching leads me to believe it's either a tooth/gum problem or the flu. Any thoughts?

UPDATE: Kitty now appears to be making slurpy noises that precede lots of dripping, then it goes away for a little bit, then more slurping and dripping. She also seems to be mildly disturbed by her leaky face (licking it a lot once she realizes she's doing it), but is otherwise still behaving normally.

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She is pretty good at opening the cabinets (I've been thinking about child-proofing), but I didn't see anything out of place, so I don't think she ate anything she wasn't supposed to.

I called the vet this morning, but by then she'd stopped drooling and seemed fine, so they said it was probably nothing serious. If she starts doing it again, I'm supposed to bring her in.