TMPRSS2 and COVID-19: COVID-19 patients often experience oral health problems, such as dry mouth, mucosal blistering, mouth rash, lip necrosis, and loss of taste and smell [1,3,7] because the angiotensin-converting enzyme-2 (ACE2) and transmembrane protease serine 2 (TMPRSS2) virus receptors of SARS-CoV-2 are expressed in the oral and oropharynx tissues [8].