Streptococcus mutans

Prevalence of S. mutans serotype k in American School Children

Novel Nanoemulsion against S. mutans

Streptococcus mutans is a significant bacterium in the field of microbiology and dental health. This Gram-positive, facultatively anaerobic bacterium is primarily known for its role in the development of dental caries (tooth decay).

Characteristics of Streptococcus mutans

Morphology and Classification

• Shape and Structure: S. mutans is a coccus (spherical) bacterium that typically forms chains.
• Gram Staining: It is Gram-positive, meaning it retains the crystal violet stain used in the Gram staining procedure.
• Oxygen Requirements: It is facultatively anaerobic, which means it can survive in both the presence and absence of oxygen.
• Classification: S. mutans belongs to the genus Streptococcus, which includes several other species that are part of the normal flora of the human mouth and throat.

Habitat

• Natural Habitat: S. mutans is commonly found in the human oral cavity, particularly in dental plaque.
• Environmental Conditions: It thrives in environments with a pH range of 5.5 to 7.5 and can survive in acidic conditions, which is a key factor in its role in tooth decay.

Pathogenic Mechanisms

Role in Dental Caries

S. mutans is a primary etiological agent in the development of dental caries. The process involves several steps:

1. Adhesion: S. mutans adheres to the tooth surface using adhesins, which are surface proteins that facilitate attachment to the enamel.
2. Biofilm Formation: Once attached, S. mutans forms a biofilm, commonly known as dental plaque. This biofilm provides a protective environment for the bacteria.
3. Acid Production: S. mutans metabolizes dietary sugars, particularly sucrose, to produce lactic acid. This acid lowers the pH in the oral cavity, leading to demineralization of the tooth enamel.
4. Cavity Formation: Continuous acid production and enamel demineralization result in the formation of cavities.

Virulence Factors

• Glucosyltransferases (GTFs): Enzymes that synthesize glucans from sucrose, aiding in biofilm formation.
• Acidogenicity: The ability to produce acid from carbohydrate metabolism.
• Aciduricity: The ability to survive and thrive in acidic environments.

Prevention and Control

Oral Hygiene Practices

• Brushing and Flossing: Regular brushing with fluoride toothpaste and flossing help remove dental plaque and reduce the population of S. mutans.
• Mouthwash: Antimicrobial mouthwashes can reduce the bacterial load in the oral cavity.

Dietary Modifications

• Reduced Sugar Intake: Limiting the consumption of sugary foods and beverages can decrease the substrate available for S. mutans to produce acid.
• Xylitol: This sugar alcohol can inhibit the growth of S. mutans and reduce the risk of dental caries.

Professional Dental Care

• Regular Dental Check-ups: Professional cleanings and examinations can help detect and manage early signs of dental caries.

Articles/Studies

Researching a Selective Antibacterial Effect Against Streptococcus mutans

Epigallocatechin gallate reduces the virulence of cariogenic Streptococcus mutans biofilm by affecting the synthesis of biofilm matrix components.

Inhibitory effect of probiotic Lactobacillus supernatants from the oral cavity on Streptococcus mutans biofilms.

Inhibitory activity of essential oils of Mentha spicata and Eucalyptus globulus on biofilms of Streptococcus mutans.

Antibacterial efficacy of manuka honey, ocimum sanctum, curcuma longa and 0.2% chlorhexidine mouthwash on the level of streptococcus mutans.

The literature suggests that EGCG has effects against S. mutans planktonic cells viability and virulence factors.

Evaluating hop extract concentrations found in commercial beer to inhibit Streptococcus mutans biofilm formation.

Comparative evaluation of garlic extract mouthwash and chlorhexidine mouthwash on salivary Streptococcus mutans count - an in vitro study.

Synergistic interaction of eugenol and antimicrobial drugs in eradication of single and mixed biofilms of Candida albicans and Streptococcus mutans.

Xylitol and erythritol inhibit real-time biofilm formation of Streptococcus mutans.

The results showed that grape phenolic extracts, especially from pomace, are highly effective against specific virulence traits of S. mutans.

Antimicrobial and antibiofilm activity against Streptococcus mutans of individual and mixtures of the main polyphenolic compounds found in chilean propolis.

Vitamin C has a negative effect on S. mutans growth and biofilm formation.

Antimicrobial activity of commercially available essential oils against Streptococcus mutans

Effects of sub-minimum inhibitory concentrations of lemon essential oil on the acid tolerance and biofilm formation of Streptococcus mutans

Antibacterial Efficacy of Mouthwash Prepared from Pomegranate, Grape Seed and Guava Extracts against Oral Streptococci: An in Vivo Study

Inhibition of Streptococcus mutans biofilm formation and virulence by Lactobacillus plantarum K41 isolated from traditional sichuan pickles.

Probiotic *Lactobacillus* sp. inhibit growth, biofilm formation and gene expression of caries‐inducing *Streptococcus mutans*

The antibacterial effect produced by ethanolic licorice root extract on S. mutans was comparable to chlorhexidine mouthwash.

Influence of cranberry juice on glucan-mediated processes involved in *Streptococcus mutans*biofilm development.

Evaluation of antimicrobial efficacy of Triphala (an Indian Ayurvedic herbal formulation) and 0.2% chlorhexidine against Streptococcus mutans biofilm formed on tooth substrate: an in vitro study.

Human cathelicidin LL-37 enhances the antibiofilm effect of EGCG on S. mutans.

Antibacterial and antioxidant effect of ethanol extracts of Terminalia chebula on Streptococcus mutans.

Probiotics could reduce high levels of Streptococcus mutans in saliva.