I'm a dentist. Can dry blood for 18hours carry HIV virus? I had a cut about 5mm with dental instrument which is probe. It bleeds a little from cut.

HIV. Although the virus makes its home in a number of bodily fluids, such as blood and semen, it is not easily communicated without direct contact between the bodily fluids of two people. The virus can live only a short time outside the human body, making it difficult to contract HIV from dried blood.
HIV risk. No. It cannot be infectious in this scenario. If you have any doubt then going on an HIV medication regime within 72 hours can prevent seroconversion and infection. I like that dr. Butler reminded you of these protocols. If you want to message me i would be happy to help you find a local expert to help.