Now completely up to date and featuring a new international author team, Marsh and Martin's Oral Microbiology, 7th Edition, remains the microbiology reference of choice for undergraduate and postgraduate dental students, researchers and a wide range of clinical dental professionals. Using a unique ecological approach, this popular textbook describes the complex relationship between the resident oral microbiome and the host in health and disease, providing a clear set of principles to explain whether the microbiota will have a beneficial or an adverse relationship with the host at a particular site.