Expert: Kristen Brannock, MPH - 8/27/2007

Question
I have been dating this guy for a few weeks who said he tested negative for HIV in the spring, and hasnt had any partners since then. I know they say not to brush or floss your teeth before oral sex, but I very lightly brushed them just to have fresh breath before sex. I just ran the bristles over the teeth, tried not to touch the gums, and didnt see any blood when I spit out. I'm pretty sure he brushed as well, but dont know how hard. We then made out and had oral. He's not a pre-cummer. It was at least a half hour later that he ejaculated on my chest, and after I very briefly put my mouth on his penis. I didn't really taste any semen, but am not sure if maybe I got a little drop in my mouth. I grew a little concerned that what if even brushing my teeth lightly and putting my mouth on him even for a second after he came was not a good idea? What do you think? Also, do you think kissing with tongue after brushing is very risky?

Answer
Anytime that infected semen, vaginal fluid, breast milk and/or blood enter another person's body, transmission is possible. Once can contract HIV from unprotected oral sex without having brushed before hand because the mouth is an opening to the body and a mucous membrane. Brushing and creating tears in the gums would only facilitate transmission.

Kissing is not risky.