Dental cavities are the most common oral health problem in children and adults, but what leads to tooth decay? Streptococcus mutans ("S.mutans") is a type of bacteria found on most tooth surfaces, and hard to reach areas like pits and fissures - the grooves found in your premolars and molars. Unfortunately for us, S. mutants are the main bacteria that promote decay and the breaking down of tooth enamel. But no need to worry, you can prevent this! Learn about streptococcus mutans, and what you can start doing to help protect your teeth.