This document discusses oral manifestations associated with HIV/AIDS. It begins with statistics on the global HIV epidemic. It then describes the pathogenesis of HIV, including how the virus binds to and infects host cells. Several oral conditions are described that are more common in HIV-positive individuals, such as oral candidiasis, oral hairy leukoplakia, Kaposi's sarcoma, and non-Hodgkin's lymphoma. Periodontal manifestations like necrotizing periodontal diseases are also discussed. The document concludes with treatments for oral lesions and how the introduction of antiretroviral therapy has reduced the frequency of oral conditions related to HIV/AIDS.