What is Miller's theory primarily concerned with?

Miller's theory is primarily focused on acidogenic microorganisms and their role in the process of dental caries formation. According to this theory, specific bacteria, such as Streptococcus mutans, produce acids as they metabolize sugars from the diet. This acid production leads to the demineralization of the tooth enamel, which is a critical step in the development of caries. The emphasis on acidogenic microorganisms highlights the importance of microbial activity in dental health, setting the foundation for understanding how these bacteria contribute to tooth decay.

In contrast, while proteolytic bacteria also play a role in caries, they are not the central focus of Miller's theory, as it specifically addresses the acid-producing aspect. Systemic health effects and risk factors for caries are broader topics that encompass more than just the microbial aspect and do not directly align with Miller's emphasis on the activity of acidogenic microbes. Thus, the focus on acidogenic microorganisms is what distinctly makes this the core concern of Miller's theory.