Funding for this research was provided by:
Research Center for Caries Prevention, Dentistry Research Institute (98-01-194-40584)
Article History
Received: 31 August 2020
Accepted: 18 February 2021
First Online: 27 February 2021
Ethics approval and consent to participate
: The Tehran University of Medical Sciences Ethics Committee approved the study (IR.TUMS.DENTISTRY.REC.1397.104). We proposed the information sheet about the study to the subjects, and written informed consent obtained from parents.
: Not applicable.
: The authors declare that they have no competing interests.