Every mouth is full of bacteria, yeasts, fungi and viruses. Can we stop these infectious microorganisms from making us sick? Today, with millions dawning facemasks, washing with antibacterial soaps, and sanitizing classrooms, hospitals and other public places, we need new solutions. Peer-reviewed research from some of the world's foremost microbiologists is now demonstrating that the probiotic bacteria in our mouth can be used to reduce or prevent infections from invading the body's internal tissues. Our oral probiotics can be our first line of defense against some of the most dangerous diseases, including those caused by aggressive bacteria, flu viruses and yeasts. In this groundbreaking book, the author details the newest research revealing the cooperative roles friendly oral bacteria play within our immune system to fight infection and prevent disease. Guidance on supplementation and on how to encourage the growth of our resident oral probiotic colonies is also described. A must read for anyone wanting to strengthen the immune system and stay healthy.