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. 2023 Jan 27;9:17. doi: 10.1186/s40814-023-01243-z

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© The Author(s) 2023

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — Internal pilot trial design diagram. ^aWhere it was not possible to conduct the first two follow-ups for the internal pilot before progression criteria review due to time constraints, pupils were asked to complete just one follow-up only to reduce burden on schools and pupils. This was completed between the time of the CBS and 12 weeks and included the question on contamination, which was required for the progression review. The exact time point for each school depended on the time available before the progression criteria review. ICDAS, International Caries Detection and Assessment System. CARIES-QC, Caries Impacts and Experiences Questionnaire for Children (child oral health-related quality of life). CHU9D, Child Health Utility-9D (child health-related quality of life)