Use of a PPMR is considered to be one mitigation strategy to control the risk of exposure to viruses, such as the novel coronavirus.  For more information, please consult the cited reference.
Vergara-Buenaventura A, Castro-Ruiz C. Use of mouthwashes against COVID-19 in dentistry [published online ahead of print, 2020 Aug 15].Br J Oral Maxillofac Surg. 2020;doi:10.1016/j.bjoms.2020.08.016
After careful review of the current information, Nova Scotia’s oral health regulators have concluded there is no compelling reason to remove hydrogen peroxide from the PPMR options.