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Based on the text, the “relevant reflex” being referred to is hand washing before and after touching your mask, regular changing of the mask, and appropriate storage.
The text specifically states: “A simple reflex,but still too often overlooked.” in the context of choosing a mask and adopting good practices. It then lists hand washing, regular changing, and appropriate storage as those good practices.
While the text discusses the mask itself as a relevant tool,the reflex it highlights is the hygiene and maintenance surrounding it’s use.
