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Effectiveness as a mouth rinse
Laboratory testing showed 80 ppm ClO2 destroyed SARS-CoV-19 in 10 seconds , and a sodium chlorite (stabilized chlorine dioxide) mouth rinse destroyed up to 98.4% in 30 seconds in simulated saliva.
Study 10 , Study 12
In small-scale study of 40 people with COVID-19, those using sodium chlorite (stabilized chlorine dioxide) mouth rinse showed more notable improvement in symptoms and recovery than those using chlorhexidine gluconate.
Study 11

Some Concentration Levels
Commonly Used
Nasal rinse 40 ppm(w/w)
Mouthwash 60-100 ppm(w/w)
of "free" chlorine dioxide
*Concentrations listed are approximated based on collaboration coordinator's best awareness of various formulations and research studies. However, they may not necessarily be the appropriate levels for a particular Chlorine Dioxide product, unless they match directions on its label.