HIV treatment can reverse this damage. Regular brushing and flossing help prevent infection. Antibiotics and mouthwashes can also treat the infection. Cold sores are small, painful lesions on the lips ...

Those fluids can enter the bloodstream of someone who doesn't have HIV during any type of sexual activity, including oral sex, through an opening such as a mouth sore or a genital ulcer.

or through sores or cuts on their mouth, hands or body. Dry sex increases the risk of HIV transmission because friction can cause sores in the vaginal wall. If instead of having sexual intercourse ...