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This vaccine uses dental floss instead of needles

Scientists have discovered that flossing between your teeth could one day help vaccinate you. By targeting a uniquely permeable gum tissue called the junctional epithelium, this new method stimulates immunity right where many infections enter: the mouth, nose, and lungs. Using dental floss on mice to apply a flu vaccine triggered a robust immune response—better than existing oral approaches and comparable to nasal vaccines, but without the risks. It even worked with mRNA and protein-based vaccines.

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