No one has ever gotten HIV through casual kissing, such as between parents and children. It is possible, but extremely unlikely, for HIV to be passed during “deep kissing.” There has been just one reported case of this kind: a woman became infected through deep kissing with a man with AIDS whose gums often bled after brushing and flossing his teeth; after this activity, the couple often engaged in deep kissing and protected sex. Although HIV transmission most likely occurred during deep kissing, it was probably the blood in the man’s mouth, not his saliva, which transmitted HIV. Both the man and the woman had gum disease that may also have contributed to the woman becoming infected. It is important to note that in this situation, HIV is not passed through saliva, but rather through direct blood-to-blood contact
