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Background  Dental caries remains the most prevalent and costly oral infectious disease worldwide, encouraging the search for new and more effective antimicrobials. Therefore, the aim of this work was to study the antimicrobial action of selected phytochemicals (eugenol, citronellol, sabinene hydrate, trans-cinnamaldehyde, terpineol and cinnamic acid) against  Streptococcus mutans  in planktonic and biofilm states as well as the cytotoxicity of these compounds.    Methods  The antibacterial activity of the selected compounds was evaluated by the determination of the minimal bactericidal concentration. The resazurin assay was used to assess the metabolic activity of sessile  S. mutans . The cytotoxicity was determined using a fibroblast cell line.    Results  Among the tested phytochemicals, citronellol, cinnamic acid and trans-cinnamaldehyde were the most effective against both planktonic and sessile  S. mutans , an effect apparently related to their hydrophobic character. Additionally, these three compounds did not compromise fibroblasts cell viability.    Discussion  Citronellol, cinnamic acid and trans-cinnamaldehyde demonstrated significant antimicrobial activity and low cytotoxicity proposing their potential as a novel group of therapeutic compounds to control oral infectious diseases. Moreover, their effects are particularly relevant when benchmarked against eugenol, a phytochemical commonly used for prosthodontic applications in dentistry.

Cytotoxicity and antimicrobial action of selected phytochemicals against planktonic and sessileStreptococcus mutans