Cavities are a well known dental problem that many people will experience at least once in their lifetime. These little holes in your teeth can form for a number of reasons, including inadequate oral hygiene, poor diet, and missing regular check ups with your dentist. Most people know the basics about cavities, but do you know the science behind how they occur? Does all bacteria cause cavities? Does your body naturally try to defend itself? How does the unfortunate process of tooth decay develop?