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On that note, I wonder how kissing affects our mouth bacteria. Like, does making out with someone transfer enough bacteria between the two people to make a difference?

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Not sure about just kissing, but here is about couples living together: https://journals.asm.org/doi/10.1128/msystems.00043-17

I have a friend who started having a lot of teeth issues after moving in together. She swears nothing else has changed (i.e. food or stuff)

Babies are born without the mouth bacteria that cause cavities, and generally acquire them from their parents (e.g. kissing or sharing utensils).

Or transmitting prechewed food. That's the old school way.

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