What are the chances of getting hiv from oral sex?what are the chances of getting hiv from oral sex?

Near zero risk. If one partner definitely has HIV, CDC has estimated the risk at one chance in 10,000 to 20,000. That's equivalent to giving or having oral sex with infected partners once daily for 27-55 years before infection might be likely. However other STDs are more likely, including gonorrhea, herpes, nongonoccal urethritis in men, and syphilis.

Chances are very low but not 0.