ABSTRACT
Introduction : The effect of toothpastes on viruses, such as SARS-CoV-2, is unknown. This study investigated the short-term effect of toothpastes containing antimicrobial properties in patients with COVID-19 to determine if they could reduce the SARS-CoV-2 salivary viral load. Methods : Hospitalized patients with COVID-19 (n = 83) were instructed to perform tooth brushing with one of three arms: a toothpaste containing 0.96% zinc (zinc oxide, zinc citrate) in a silica base (Test 1);toothpaste containing 0.454% SnF2 in a silica base (Test 2), and a nonantibacterial toothpaste (control). Saliva was collected before intervention (T0), immediately after intervention (T1), and 30 (T2) and 60 min (T3) after intervention. The SARS-CoV-2 salivary viral load was measured using quantitative real-time polymerase chain reaction (qRT-PCR) assays. For Test 1 and Test 2 toothpastes, the fold reductions were normalized to baseline and to the control toothpaste at each time point after brushing. A fold change of ≥2 is considered clinically effective. Results : Brushing with the Test 1 toothpaste reduced the SARS-CoV-2 salivary viral load by 4.06-fold at T1, by 2.36-fold at T2, and by 1.42-fold at T3. Similarly, brushing with a Test 2 toothpaste reduced the SARS-CoV-2 salivary viral load by 2.33-fold at T1, by 2.38-fold at T2, and by 0.77-fold at T3. Conclusion : Immediately after brushing, the use of antimicrobial toothpastes reduced the salivary viral load of patients with COVID-19. The trial was registered on https://clinicaltrials.gov/ (NCT04537962).