Medical history, oral hygiene habits and demographics
Medical history was obtained as part of the visit, including demographics, oral hygiene habits (e.g., use of mouthwashes and time of last oral hygiene procedure) and concomitant drug use information. Medical history also included relevant results of physical exam, biochemical analysis, diagnostic imaging, COVID-19 test and strain of SARS-CoV-2 variant.Source documents consisted of patient hospital records (paper or electronic notes) as well as COVID-19 test results/certificates.