Effect of Human Milk and its Components on Streptococcus Mutans Biofilm Formation

Area of Science:

• Microbiology
• Oral Health
• Biochemistry

Background:

• Dental caries is a common oral disease.
• Streptococcus mutans is a primary pathogen in dental caries.
• The role of human breast milk in caries development is not fully understood.

Purpose of the Study:

• To investigate the effect of human breast milk and its components on Streptococcus mutans biofilm formation.
• To analyze the nutritional impact of human breast milk on the caries process.

Main Methods:

• Human breast milk collected from 11 mothers (3-9 months postpartum).
• Streptococcus mutans UA159 cultures treated with breast milk dilutions and components (lactose, lactoferrin, IgA, bovine casein).
• Biofilm mass quantified using crystal violet staining and absorbance measurements.

Main Results:

• Human breast milk (dilutions 1:10-1:2,560) increased S. mutans biofilm formation 1.5-3.8 fold.
• Lactoferrin and IgA significantly decreased biofilm formation at high concentrations.
• Casein significantly increased biofilm formation at concentrations above average milk content.

Conclusions:

• Human breast milk, particularly components like casein, can promote S. mutans biofilm formation.
• Lactoferrin and IgA show potential anti-biofilm properties.
• Findings support the initiation of oral hygiene practices upon tooth eruption to mitigate caries risk.