Which organism is usually associated with the onset of dental caries?

Streptococcus, particularly Streptococcus mutans, plays a pivotal role in the development of dental caries. This organism is known for its ability to metabolize sugars and produce acid as a byproduct. The acid produced can de-mineralize tooth enamel, leading to the formation of cavities. Streptococcus mutans adheres to the tooth surface and contributes to the formation of dental plaque, which provides a conducive environment for caries development.

The process begins when sugars are consumed, and the acid production by Streptococcus mutans lowers the pH around the teeth, leading to an imbalance in the enamel's mineralization and demineralization. Over time, this can result in the decay associated with caries. Thus, Streptococcus is central to the onset of dental caries due to its specific pathogenic attributes and its role in the oral ecosystem.