The third clinic of Peking University Stomatological Hospital has advanced diagnosis and treatment instruments, including digital imaging system, oral endoscope, advanced dental cleaner, dental implant machine, electronic root canal therapy machine, computer colorimeter and so on. In order to prevent cross infection, advanced disinfection equipment and isolation equipment are used. Disinfection measures are standardized and strictly managed, and one person and one machine are implemented to prevent cross-infection of infectious diseases such as hepatitis B and AIDS.