Oral Antimicrobial Efficacy in Dental Hygiene Practices

Oral hygiene relies on both mechanical disruption of dental plaque and the adjunctive use of antimicrobial agents to control pathogenic biofilms and maintain a balanced microbial community. While conventional agents such as chlorhexidine and essential-oil formulations have long been regarded as gold standards for plaque and gingivitis control, their non-selective activity can perturb the native microbiome and foster resistance. Recent work has therefore emphasised targeted approaches that suppress disease-associated taxa while preserving commensal and nitrate-reducing bacteria. Advances in bioadhesive delivery systems, phytochemical additives and peptide-mimetic compounds promise improved retention, deeper biofilm penetration and reduced host cytotoxicity. An integrated understanding of microbial composition, resistance gene dynamics and host-microbe interactions is shaping next-generation oral care products with global significance for both preventive dentistry and the management of systemic risks linked to oral dysbiosis.

Research from Nature Portfolio

Seminal investigations have elucidated the systemic and ecological consequences of routine antiseptic mouthwash use. In a controlled crossover study, seven-day exposure to a chlorhexidine rinse induced a marked shift in salivary bacterial composition, characterised by increased Firmicutes and Proteobacteria and reduced nitrate-reducing Bacteroidetes and Fusobacteria. These microbial changes correlated with lower salivary pH and nitrite concentrations, and a trend towards elevated blood pressure. Such findings underscore the broader physiological impact of oral antimicrobials and highlight the need to balance antimicrobial potency with preservation of beneficial microbial functions.

Oral Antimicrobial Efficacy in Dental Hygiene Practices publication trend

The graph below shows the total number of articles in oral antimicrobial efficacy in dental hygiene practices across all publications each year (not limited to Nature Index journals).

Technical terms

Biofilm: A structured community of microorganisms attached to a surface and embedded in a self-produced matrix, often exhibiting enhanced resistance to antimicrobials.

Oral microbiome: The collective community of bacteria, fungi and viruses inhabiting the oral cavity, which contributes to health and disease.

Antimicrobial resistance gene (ARG): A genetic element that enables microorganisms to survive exposure to antimicrobial agents.

Phytochemical: A biologically active compound derived from plants, often used for targeted antimicrobial activity.

Ceragenins: Synthetic lipid analogues of host defence peptides that disrupt microbial membranes, offering broad-spectrum activity with reduced cytotoxicity.

References

1. A mouthwash formulated with o-cymen-5-ol and zinc chloride specifically targets potential pathogens without impairing the native oral microbiome in healthy individuals. Journal of Oral Microbiology (2023).
2. Efficacy of Ceragenins in Controlling the Growth of Oral Microorganisms: Implications for Oral Hygiene Management. Pharmaceuticals (2024).
3. Chlorhexidine digluconate mouthwash alters the oral microbial composition and affects the prevalence of antimicrobial resistance genes. Frontiers in Microbiology (2024).
4. Effects of Chlorhexidine mouthwash on the oral microbiome. Scientific Reports (2020).