Table 1 Intervention development using TIDieR checklist [37]

Why (rationale, theory, goal)

Oral health problems are common in childhood but preventable. Poor oral health is more common in children with CLP with potential to disrupt orthodontic and surgical treatments. Interventions to increase knowledge have had limited effect on children’s oral health. Implementation intentions are a well-evidenced technique to promote behaviour change. This study describes the development of an intervention to teach parents and children with CLP to use ‘if-then’ plans to implement their intentions to promote oral health behaviour.

What

1. Materials for intervention and training (access to materials)

2. Procedures (describe activities and support activities)

Video animation, ‘if-then’ planning sheets for intervention groups and standard oral health advice for all groups.

Training for dental care practitioners (DCP) to help parents and children learn about ‘if-then’ plans and identify their own plans to addressing oral health difficulties

Who provided (describe expertise, background, specific training)

The intervention is designed for delivery by dental care professionals.

Professional animator designed video with input from multidisciplinary study team and study advisory group.

Health psychologist provided training for DCP

DCP deliver intervention (trained in dental health promotion).

How (modes of delivery, e.g. face to face/individual group)

Video training delivered to children and parents together face to face in the home setting. A video animation tutorial is available for them throughout the study.

If-then planning sheet completed by parent and child with support from DCP. Families are encouraged to place somewhere prominent.

Where (types of locations)

Children’s home

When and how much (how often is intervention delivered, duration)

One session learning about if-then plans (duration is subject of research)

Booster in the form of email/text or letter with picture of original ‘if/then’ plan.

Tailoring (how will intervention be individualized)

Intervention is designed to be individually tailored as part of consultation between DCP and parent/child.

Modifications (any changes during the study)

Reported throughout the feasibility study

How well

1. Intervention fidelity assessed by

2. Actual adherence

Feasibility study involves evaluation of behaviour, clinical outcomes and perception of technique and interaction with plan. The intervention fidelity will be assessed by photographing the initial ‘if-then’ plan, qualitative exit interviews with participants and the DCP who deliver the intervention.