Researchers have developed a novel vaccine delivery method using antigen-coated dental floss to target the junctional epithelium within the gingival sulcus. This specific oral tissue is highly permeable and rich in immune cells, allowing for the induction of both systemic and mucosal immunity. Animal studies demonstrate that this approach provides protection against influenza and maintains high delivery efficiency even when food and water are consumed. In human trials, participants found the floss-pick technology to be painless and easy to use, with a vast majority preferring it over traditional needles. This needle-free alternative could improve global vaccination rates by enabling self-administration and eliminating the need for refrigerated transport.