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8 ISSN Print 0719-2460 ISSN Online 0719-2479. www.joralres.com/2020 The current situation due to the pandemic of coronavirus disease 2019 (COVID-19) is everyday more alarming. According to the World Health Organization (WHO), as of 3 June 2020, 6.287.771 infected people have been reported with a fatality rate of 6.04%.1 These are worrisome facts concerning public health, owing to the exponential growth of the cases. Facing this context, there are many specialties in the medical field that according to their experience are contributing to the clinical area to inform about a series of protocols aiming at protecting professionals’ health whilst providing medical care. WHO has given recommendations on the correct use of personal protective equipment.2 It has also provided professionals and the public in general with a series of protocols concerning accurate and systematic hand washing and fomite disinfection, such as surfaces exposed to contamination by saliva droplets.3 However, the advantages of frequent brushing and rising of the oral cavity with 1% hydrogen peroxide or 0.2% povidone have not been given due importance as a possible preventative measure to reduce the risk of severe cardiovascular or respiratory complications in patients exposed to COVID-19. The metagenomics studies of patients with COVID-19 from different countries (China, Brazil, Peru, Cambodia) show that infection by coronavirus type 2 (SARS-CoV-2), which causes COVID-19, allows anaerobic bacteria to colonize the lungs and lead to severe respiratory complications (pneumonia).3 These anaerobic bacteria, such as Streptococcus mutans, Prevotella spp., Fusobacterium spp., Capnocytophaga spp., and Actinomyces spp. among others, exist in a greater quantity in the saliva of patients with periodontal problems and poor oral hygiene.4,5 Moreover, according to what has been reported before the COVID-19 pandemic, it was known that these bacteria could cause cardiovascular and/or respiratory systemic complications in some patients.5 During the incubation period SARS-CoV-2 lodges mainly in the epithelial cells of the salivary gland excretory ducts because these cells contain the angiotensin-converting-enzyme-2 (ACE2) receptor to which the coronavirus type 2 binds in order to enter the cell and replicate. This fact explains why saliva is the main means of contagion via coughing or sneezing. Later, this virus enters the circulatory and respiratory systems, César Cayo-Rojas.1,2,3 Luis Cervantes-Ganoza.1,2

Importance of oral hygiene as a preventive measure against possible COVID-19 complications