Oral health behaviours of parents and young children in a practice-based caries prevention trial in Northern Ireland.

Objectives: The NICPIP trial evaluated the costs and effects of a caries prevention intervention delivered to 2- to 3-year-old children attending dental practices in Northern Ireland. This supplementary study explored the oral health behaviours of children and their parents to help understand the reasons for the trial's findings.

Methods: A mixed methods study that included a questionnaire completed by all parents (n = 1058) at the time they brought their child for the NICPIP final clinical assessment.