The oral health of older people living in residential aged care facilities has been widely recognised as inadequate. The aim of this paper is to identify barriers to effective engagement of health-care providers in oral care in residential aged care facilities. A literature review was conducted using MEDline, CINAHL, Web of Science, Academic Search Complete and PsychInfo between 2000 and 2013, with a grey literature search of government and non-government organisation policy papers, conference proceedings and theses. Keywords included: dental/oral care, residential aged care, health-care providers, barriers, constraints, and limitations. A thematic framework was used to synthesise the literature according to a series of oral health-care provision barriers, health-care provider barriers, and cross-sector collaborative barriers. A range of system, service and practitioner level barriers were identified that could impede effective communication/collaboration between different health-care providers, residents and carers regarding oral care, and these were further impeded by internal barriers at each level. Findings indicated several areas for investigation and consideration regarding policy and practice improvements. While further research is required, some key areas should be addressed if oral health care in residential aged care services is to be improved.