Cariogenic bacteria and tooth mineral matrix

The "Cariogenic bacteria and tooth mineral matrix" represents the pathological interaction between acid-producing oral microorganisms and the inorganic structure of the tooth [NIH NIDCR, 2023]. The primary biological drivers are bacteria such as Streptococcus mutans, which form a complex biofilm (dental plaque) on the tooth surface and ferment dietary carbohydrates into organic acids [StatPearls, 2023]. These acids lower the local pH below the critical level of 5.5, causing the dissolution of the tooth mineral matrix, which is primarily composed of hydroxyapatite [PubMed, PMID: 28753331]. This demineralization process leads to the development of dental caries, a widespread infectious disease characterized by the destruction of enamel and dentin [WHO, 2023]. Therapeutic interventions target this system by either reducing the bacterial load using antiseptics like chlorhexidine or by strengthening the mineral matrix using fluoride [PubChem, CID: 24247]. Fluoride works by facilitating the formation of fluorapatite, which is more resistant to acid than hydroxyapatite, and by inhibiting bacterial metabolic enzymes like enolase [StatPearls, 2023]. Additionally, agents like xylitol and arginine are used to modulate the biofilm's metabolic activity and promote a more alkaline environment [Journal of Dentistry, 2019].

Other names

Dental plaqueOral biofilmTooth enamel matrixHydroxyapatiteCariogenic nicheDental caries complex

Fluoride ions promote remineralization by forming fluorapatite and inhibit bacterial enolase; Chlorhexidine acts as a broad-spectrum antiseptic by disrupting bacterial cell membranes; Xylitol reduces the growth of Streptococcus mutans by interfering with glucose transport; Arginine metabolism produces ammonia to neutralize plaque acids.