Access to oral health in primary care before and after the beginning of the COVID-19 pandemic in Brazil. SciELO Preprints, 2020. DOI: 10.1590/SciELOPreprints.819. Disponível em: https://preprints.scielo.org/index.php/scielo/preprint/view/819. Acesso em: 15 nov. 2026.