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Background  Excessive biofilm formation on surfaces in the oral cavity is amongst the main reasons for severe infection development like periodontitis and peri-implantitis. Mechanical biofilm removal as well as the use of adjuvant antiseptics supports the prevention of pathogenic biofilm formation. Recently, the antibacterial effect of the oral care product REPHA-OS ® , based on medicinal plant extracts and essential oils, has been demonstrated on oral pathogens grown on agar plates. In the present study, the effectiveness of the product on medical relevant oral biofilm development should be demonstrated for the first time.    Methods  An established in vitro oral multispecies biofilm, composed of  Streptococcus oralis, Actinomyces naeslundii, Veillonella dispar  and  Porphyromonas gingivalis,  was used to analyze the antibacterial effect of different REPHA-OS ®  concentrations on planktonic bacteria, biofilm formation and mature biofilms. It was quantified using metabolic activity assays and live/dead fluorescence staining combined with three-dimensional confocal laser-scanning microscopy. Additionally, effects on species distribution inside the biofilm were assessed by means of quantitative real-time PCR.    Results  REPHA-OS ®  showed statistically significant antimicrobial effects on all stages of biofilm development: a minimal inhibitory concentration of 5% could be detected for both, for planktonic bacteria and for biofilm formation. Interestingly, only a slightly higher concentration of 10% was necessary to completely kill all bacteria in mature biofilms also. In contrast, an influence on the biofilm matrix or the species distribution could not be observed. The effect could be attributed to the herbal ingredients, not to the contained ethanol.    Conclusion  The strong antibacterial effect of REPHA-OS ®  on different stages of oral biofilm development strengthens its application as an alternative adjuvant in oral care therapies.    Supplementary Information  The online version contains supplementary material available at 10.1186/s12903-021-01504-4.

Plant-based oral care product exhibits antibacterial effects on different stages of oral multispecies biofilm development in vitro