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Jan E Clarkson, Nigel B Pitts, Beatriz Goulao, Dwayne Boyers, Craig R Ramsay, Ruth Floate, Hazel J Braid, Patrick A Fee, Fiona S Ord, Helen V Worthington, Marjon van der Pol, Linda Young, Ruth Freeman, Jill Gouick, Gerald M Humphris, Fiona E Mitchell, Alison M McDonald, John DT Norrie, Kirsty Sim, Gail Douglas & David Ricketts.

Jan E Clarkson ^1,*,†, Nigel B Pitts ^2,†, Beatriz Goulao ³, Dwayne Boyers ⁴, Craig R Ramsay ³, Ruth Floate ¹, Hazel J Braid ¹, Patrick A Fee ¹, Fiona S Ord ¹, Helen V Worthington ⁵, Marjon van der Pol ⁴, Linda Young ⁶, Ruth Freeman ¹, Jill Gouick ¹, Gerald M Humphris ⁷, Fiona E Mitchell ¹, Alison M McDonald ³, John DT Norrie ³, Kirsty Sim ¹, Gail Douglas ⁸, David Ricketts ¹

¹ Dental Health Services Research Unit, University of Dundee, Dundee, UK
² Faculty of Dentistry, Oral & Craniofacial Sciences, King’s College London, London, UK
³ Health Services Research Unit, University of Aberdeen, Aberdeen, UK
⁴ Health Economics Research Unit, University of Aberdeen, Aberdeen, UK
⁵ School of Dentistry, University of Manchester, Manchester, UK
⁶ Dental Directorate, NHS Education for Scotland, Edinburgh, UK
⁷ School of Medicine, University of St Andrews, St Andrews, UK
⁸ School of Dentistry, University of Leeds, Leeds, UK
^* Corresponding author Email: p.fee@dundee.ac.uk

^† Co-clinical investigator

Co-clinical investigator

Declared competing interests of authors: Nigel B Pitts consults for Colgate (Colgate-Palmolive Company, New York, NY, USA) and GlaxoSmithKline plc (Brentford, UK) (toothpaste manufacturers) and was also a co-applicant on the National Institute for Health Research (NIHR) Health Technology Assessment (HTA) Improving the Quality of Dentistry trial of dental scale and polish. Craig R Ramsay is a member of the NIHR HTA General Board. John DT Norrie reports grants from the University of Aberdeen and grants from the University of Edinburgh during the conduct of the study, and declares membership of the following NIHR boards: CPR decision making committee, HTA Commissioning Board, HTA Commissioning Sub-Board (Expression of Interest), HTA Funding Boards Policy Group, HTA General Board, HTA Post-Board funding teleconference, NIHR Clinical Trials Unit Standing Advisory Committee, NIHR HTA and Efficacy and Mechanism Evaluation Editorial Board and the Pre-exposure Prophylaxis Impact Review Panel. Gail Douglas reports that she is employed full time by the University of Leeds; 1 day of her time is bought out by Public Health England to assist with academic input to the dental epidemiology programme for England. She is also currently President of the British Association for the Study of Community Dentistry, a professional organisation principally for those working in the field of dental public health or allied areas.