Biology of Oral Streptococci

Area of Science:

• Microbiology
• Oral Biology
• Bacteriology

Background:

• Streptococcus bacteria are primary oral cavity inhabitants, crucial for oral microbiota development.
• The Streptococcus genus is taxonomically complex, with oral species found in six of its eight groups.
• Oral streptococci possess adhesive molecules for tissue colonization and carbohydrate metabolism.

Purpose of the Study:

• To review the diverse oral environments occupied by Streptococcus species.
• To highlight the dual role of oral streptococci in health and disease.
• To discuss the taxonomic classification and functional characteristics of oral streptococci.

Main Methods:

• Literature review and synthesis of existing research on oral streptococci.
• Analysis of Streptococcus taxonomy and species distribution in oral niches.
• Examination of Streptococcus metabolic capabilities, including acid and alkali production, and hydrogen peroxide generation.

Main Results:

• Oral streptococci inhabit various oral niches, with species categorized into six taxonomic groups.
• Acidogenic species like Streptococcus mutans contribute to dental caries.
• Alkaline-producing species (e.g., Streptococcus salivarius) and hydrogen peroxide producers offer protective effects against pathogens.

Conclusions:

• Oral streptococci exhibit diverse roles, from cariogenic to protective, influencing oral homeostasis.
• Understanding Streptococcus's ecological and metabolic functions is key to managing oral health.
• Certain oral streptococci can cause systemic infections like infective endocarditis if they enter the bloodstream.