I am not a medical professional but generally the risk is considered to be low.
Oral sex is “low risk” in terms of HIV transmission. That means, you probably will not get HIV from giving or receiving oral sex. Having cuts or sores in your mouth, gum disease, having a sexually-transmitted infection (STI) in your throat, or recent dental work increases your risk.
Although the chance of getting infected with HIV from oral sex is very low, you can get other STIs such as gonorrhea and chlamydia if you give or receive oral sex.
You can prevent STI infection during oral sex by using a condom or dental dam. You can prevent further transmission of STIs by regularly getting tested and treated for STIs.
https://www.sfaf.org/resource-library/hiv-faqs/