METHODS: An interpretative phenomenological analysis (IPA) study design was used to recruit a purposive sample of foster carers in Tower Hamlets, United Kingdom, from a range of backgrounds (maximum variation sampling). Participants were aged 21 years and older and provided full-time foster care for children for a minimum of 1 year. The foster carers took part in focus groups that were audio-recorded and transcribed verbatim. Data analysis followed a five-step IPA process, which included reading the transcripts, note taking, identifying emerging themes, connecting related themes and writing up the final themes. Iterative data gathering and analysis continued to reach thematic saturation.

RESULTS: Three focus groups were conducted, involving a total of 12 foster carers. Eight of the 12 participants had fostered children for more than 10 years and they were currently fostering 22 children aged five to 18 years old. Four themes emerged from within the context of the supportive and nurturing foster family environment that described how foster carers' responded to and managed the oral health of their foster children. Foster carers had adopted an oral health caregiving role, "in loco parentis" responding to the poor oral health of their vulnerable foster children. They were hypervigilant about establishing and monitoring children's oral health routines and taking their children to see a dentist; these were seen as an integral part of being good foster carers. They were knowledgeable about the causes of children's oral ill health, gained from their own dental experiences and from looking after their own children. Foster carers had experienced tensions while adopting this oral health caregiving role with dentists who had refused to see younger children. Foster carers had also experienced tensions with teenage foster children who questioned their parental authority and legitimate right to set rules about smoking and healthy eating.