National Dental Hygiene Certification Exam (NDHCE) Practice 2025 - Free Dental Hygiene Practice Questions and Study Guide

Chlorhexidine is primarily known for its effectiveness in reducing the levels of various microorganisms, particularly in dental and oral care contexts. Streptococcus mutans is a key bacterium associated with dental caries (cavities) and oral biofilm. Chlorhexidine works by disrupting the cell membranes of bacteria and inhibiting their growth and metabolism, making it particularly effective against this cariogenic bacterium.

The use of chlorhexidine as a mouth rinse or in dental treatments is aimed at controlling plaque formation and decreasing the incidence of cavities primarily caused by Streptococcus mutans. This is why it is a common recommendation in dental hygiene practices, especially for patients at higher risk for dental caries.

While chlorhexidine can suppress other microorganisms, its action against Streptococcus mutans is particularly significant due to the bacterium's role in the development of dental caries, which is a central concern in dental health.