No risk, no worry: Kissing, oral sex, or other exposures to saliva are no risk for HIV. Saliva inhibits the virus. In theory, a canker sore might slightly increase the risk. Still, choose your sex partners wisely: if you have reason to believe your kissing partner is high risk for HIV, ask him or her to be tested before you start any sexual activity with him or her.
Answered 6/27/2019
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