Cariogenic microorganisms

Cariogenic microorganisms refer to a complex community of bacteria, most notably Streptococcus mutans, Streptococcus sobrinus, and various Lactobacillus species, that are the primary drivers of dental caries (Lemos et al., 2019, Microbiol Spectr). These organisms are characterized by their ability to ferment dietary sugars into organic acids, such as lactic acid, which significantly lowers the pH within the oral environment and leads to the demineralization of tooth enamel (StatPearls, 2023). A defining feature of these microbes is their capacity to produce extracellular polysaccharides (glucans) that facilitate the formation of a resilient biofilm, or dental plaque, which protects the bacteria from host defenses and antimicrobial agents (NCBI, PMC2830005). Therapeutic strategies often involve the use of broad-spectrum antimicrobials like chlorhexidine or metabolic inhibitors like fluoride to reduce microbial load and acid output. However, because this target represents a collective of diverse species rather than a single molecular entity, it is considered a broad pathological category in dental medicine rather than a specific pharmacological target (NIH, 2021).

Other names

Cariogenic bacteriaAcidogenic oral bacteriaDental plaque bacteriaTooth-decaying microorganisms

Drugs targeting cariogenic microorganisms work through several pathways: fluoride inhibits the bacterial enzyme enolase and decreases acid tolerance; chlorhexidine and cetylpyridinium chloride act as cationic surfactants that disrupt the bacterial cell membrane; and xylitol acts as a non-fermentable sugar alcohol that causes a 'futile cycle' in bacteria like S. mutans, inhibiting their growth and acid production (Marquis, 1995, Can J Microbiol; Jones, 1997, J Dent).