Background:
     
     The oral health status of older people living in residential aged care facilities (RACFs) is found to be very poor. Many oral health promotion interventions have been tested in RACF settings around the world with varying degrees of success.
   

Aim:
     
     The aim of this systematic review is to analyse the health promotion strategies used in oral health promotion interventions in RACF settings and map the behaviour change techniques (BCTs) used in interventions to the Behaviour Change Techniques Taxonomy Version 1 (BCTTV1). This will help us identify the BCTs that are used and how effective they are in improving oral health outcomes for residents and the knowledge, attitudes and skills of caregivers in providing mouth care assistance to residents of RACFs.
   

Methods:
     
     A database search was conducted in MEDLINE, Cochrane CENTRAL, Cochrane Database of Systematic Reviews (CDSR), EMBASE, PsycINFO, CINAHL and Web of Sciences databases to screen for articles relevant to the topic of the review; after full-text review a total of 31 articles comprising both randomised controlled trials and non-randomised intervention studies were included in this review. Risks of bias in randomised studies were assessed using the ROB2 tool and ROBINS-I was used to evaluate non-randomised studies. The description of intervention content in each study was coded for the presence of BCTs by two independent review authors trained in coding BCTs according to BCTTv1.
   

Results:
     
     The most commonly used BCTs were 'demonstration of behaviour', 'instruction on how to perform behaviour' and 'credible source'. These BCTs were effective in improving oral health outcomes and knowledge of caregivers on short-term follow-up. A higher number of BCTs were coded in studies that showed significant improvement in oral health outcomes of residents on long-term follow-up with rarely used BCTs related to 'monitoring and feedback' being coded in majority of studies that showed consistent improvement in oral health outcomes of residents.
   

Conclusion:
     
     This review identified the most commonly used BCTs used in health promotion interventions to improve oral health among older people in RACFs and found that majority of interventions were targeted towards 'knowledge transfer' and were inconsistent in improving oral health outcomes for residents over long-term. Well conducted studies with use of theoretical behaviour change frameworks to develop oral health promotion interventions are needed as majority of strategies used currently do not demonstrate consistent effectiveness in improving oral health outcomes for residents of RACFs.