Mouth infections

okay, so I've never really been the kind of person to make out with people that I don't know that well.. I normally know them and their history at least a little bit, so my question is whether or not I can get any sort of infection by just making out with someone? I don't have any reason to believe that the person in question had any sort of infection, but if so what should I look out for? I'm just kind of paranoid so please have mercy on me