Sorry to ask question again, rather confused with previous answers. about thirty years ago i let our family dog lick in my mouth and around my teeth. would i know if i had been infected? should i worry ? thank you?

Stop Worrying: Unless you have some discomfort in your mouth now that is bothering you please give up on being concerned about this. Brush your teeth well every night , floss them, and have them professionally cleaned regularly. You have made it for thirty more years, and it is an unhealthy obsession to keep pondering about this. Best wishes.

Saliva DNA test: Dogs and humans often have different kinds of bacteria, but as we live with dogs we could end up exchanging saliva accidentally. It is unlikely you got worrysome infection by your pup, but you can test your mouth bacteria's DNA to find if you have harmful bacteria, and if so whether you have them at a dangerous amount or not. Ask a dentist if s/he runs "oral pathogen DNA test". Hope this helps!

Not after 30 years: If you had an infection you would have known it years ago .If you kissed another person with poor oral hygiene or disease now or thirty years than you would have a better chance of infection .Your dog probably has a cleaner mouth than a lot people.