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https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/724777/Carbon_modelling_within_dentistry.pdf
(accessed 16 July 2018).
2. Public Health England, Department of Health. Delivering Better Oral Health (March 2017).
https://www.gov.uk/government/publications/delivering-better-oral-health-an-evidence-based-toolkit-for-prevention
(accessed 16 July 2018).