Funding for this research was provided by:
Ministry of Health of the Republic of Poland (National Program of Oral Health Monitoring)
Received: 10 May 2021
Accepted: 23 September 2021
First Online: 12 October 2021
: The authors declare that they have no competing interests.
: The research was approved by the Bioethics Committee of the Medical University of Warsaw.
: Not applicable.
: Both parents and children received written and oral information about the study, and written consent was obtained from parents of adolescents for the participation in the study.
: The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.