If you want to know which behaviors are at risk of transmitting HIV, you should know how HIV is transmitted. AIDS is a blood-borne disease, so it can be transmitted sexually, through blood transmission, and from mother to child. In the case of sexual transmission, unprotected sex carries the risk of HIV transmission. For blood transmission, sharing needles or syringes with others also carries the risk of transmission, or performing invasive procedures such as tooth extraction, tattooing, eyebrow tattooing, or sharing toothbrushes, razors, or facial scrapers in informal medical settings. For mother-to-child transmission, mothers with AIDS are at risk of transmitting the virus to their babies during and after pregnancy, and should therefore be under medical supervision.