In this paper is to examine the infection control cognition and to practice that dental infection control of dental hospital accreditation. The subjects on the study were dental hygienists in Daegu and Kyungbuk cities from April to May 2015. The questionnaires of this study, with reference to the previous studies, modified and complemented. Data analysis was conducted with SPSS 20.0. First, factors of dental infection control according to workplace depended existence chief of dental infection management in small numbers and almost of these don t have programs and education of dental infection control. Thus these found out cognition of not hospital accreditation but also infection control rules in that. Also cognition and to practice of dental infection control showed in difference according to workplace that the protection individual, asepsis procedure, control of dental equipment, control of infectious waste and laundry. Thus these differed that was according to whether or not cognitive and to practice dental hospital accreditation and infection control rules in dental hospital accreditation. Finally dental hospital more than dental clinic was awareness that was infection control rules in dental hospital accreditation of cognition and to practice of the infection control. thus that was higher in cognition and to practice of infection control. As above results, in order to minimize the infection prevention in the dental clinic, the regular infection control system and infection control education. In the end these dental infection control guidelines should be placed in hospitals to increase cognition and practice.