A British study found that chewing can activate an oral immune cell called Th17, which protects the mouth from common bacterial and fungal infections. Researchers fed mice with harder food in the laboratory. Increasing the number of times they chewed when they ate, which successfully led to an increase in the number of Th17 immune cells in mice, demonstrating the effect of chewing on activating the relevant immune system. Unlike immune cells in the skin, intestine and other parts, The activation mechanism is relatively unique. It is not activated by the appearance of bacteria, but by chewing behavior, which triggers an immune response in the gums. The text is intended to explain:. ['The unique mechanism of Th17 immune cell activation is that it is activated by chewing.', 'Immune cells in the mouth that resist bacterial and fungal infections can only be activated by chewing.', 'Chewing behavior evokes an immune response in the gums more than bacteria.', 'Proper chewing behavior helps boost oral immunity.']