Funding for this research was provided by:
Department of Clinical Dentistry of the University of Bergen (Not applicable)
Received: 30 August 2019
Accepted: 9 June 2020
First Online: 12 June 2020
Ethics approval and consent to participate
: Ethical clearance was obtained prior to study from the ethical research committee in Norway (REK VEST, reference number 2015/2477) and the Medical Research Coordinating Committee of Ministry of Health and Social Welfare in Tanzania (reference number NIMR/HQ/R.8a/VOL.IX/2214). Permission to work with adolescents was obtained from Ministry of Education and Vocational Training through Monduli and Longido district councils and their respective educational authorities. Participation was voluntary and without compensation. Prior to the participation, informed written signed consent was obtained from their parents. Only adolescents who assented and with signed consent from their parents were invited to participate in the study. If needed relevant advice and/or referral to the district hospital were given free of charge.
: Not applicable.
: The authors declare that they have no competing interests.