The Inhibitory Effect of Aqueous Extract of Siwak Plant Salvadora persica on Lactic Acid Bacteria Streptococcus and Lactobacillus spp. Isolated from Human Mouth

The study includes the isolation and identification of lactic acid bacteria which are considered as members of normal flora of the human mouth. These include the Lactobacillus and Streptococcus spp. on Mitis Salvarus Agar medium. Identification of these bacteria was performed depending on morphological and biochemical crieteria and the following species were identified: Lactobacillus casie, Lact. brevis, Lact. acidophilus, Lact .salivarius, Lact. fermenti, Streptococcus mitis, Str. salivarius, The study includes also the effect of the aqueous extract of Salvadora persica on the isolated bacteria which showed antiseptic effect on all species under the study