The use of plants has been closely associated with dental hygiene and therapeutic practices for thousands of years. Instead, herbal chewing sticks taken from plants, shrubs, or trees with high antimicrobial activity are used for relieving dental problems. In order to evaluate another alternative substance for the disinfection of dentures, the present study was carried out on the antimicrobial activities of two extracts of chewing sticks collected in the Algerian Sahara, Salvadora persica and Juglans regia.

Material and methods. The anti-biofilm activity was tested in vitro on artificial biofilms of Streptococcus gordonii adhered to acrylic resin, and visualized by scanning electron microscopy.

Results. The results show the effectiveness of the extracts against planktonic and sessile strains, without mechanical action. Conclusion. Taking into account the antimicrobial effect of these two plants, this report constitutes a basis for further studies on the anti-biofilm activity of the active components in vivo, always with the aim of promoting the interest of the research of agents natural anti-plaque for oral care products, especially for wearers of dentures.