oral sex is not a risk for HIV you were not at risk, now any follow up questions should be posted in the HIV forum.
what do u mean by hiv infection?
all hiv questions need to be asked in ther hiv forum
but what are the chances of hiv?
If there were any cuts, nicks, or grazes where you shaved your penis then it is possible that you could have picked up an HIV infection. The gauze where she had her tooth removed won't make any difference at all, that's not enough to prevent blood moving.
The chances are small, but there's a definite chance, and I'd advise getting tested. I think the infection does not show up in your blood immediately after the incident, so I think the test has to take place some time after, I can't remember how long you have to wait.