Xerostomia (oral dryness) iss categorized according to participants' self-reported perception as either no dry mouth (score 0), or dry mouth (score 1). Participants are asked whether the symptoms of xerostomia started before or after COVID-19 infection and are asked open-ended questions where they could describe their experience of oral dryness. Finally, they are asked to report whether there are food items that they had to refrain from eating because of parosmia, dysgeusia, dysesthesia or xerostomia.

Dysesthesia (oral burning sensation) iss categorized as either no dysesthesia (score 0), or dysesthesia (score 1). Participants report how often they experienced dysesthesia (constantly, daily, sometimes, periodically, during meals, in between meals), asked to describe where in the mouth they experienced dysesthesia (whole tongue, anterior tongue, lips, palate, buccal mucosa, other), and identify food items that enhanced the dysesthesia (spicy, sweet, sour, salty, bitter).