Oral diseases continue to be a significant health problem throughout the world. Oral cavity and teeth diseases are among the most important global-level common oral health problems. Medicinal plant extracts could be an essential natural alternative to prevent microbial growth in oral diseases. This study aims to determine the in vitro antibacterial activities of plant leaves, bark and resins of four medicinal plants Camellia sinensis, Terminalia arjuna, Acacia chundra and Acacia nilotica against three oral bacteria, Staphylococcus aureus, Streptococcus mutans and Lactobacillus sp. In vitro antibacterial potential of the ethanol, hot and cold water extracts were evaluated using the agar well diffusion method. The minimum inhibitory concentration (MIC) of the extracts were determined using the microdilution technique. The phytochemicals present in the extracts were determined by qualitative methods. Except the hot and cold extracts of A.nilotica, all other test extracts revealed an inhibitory effect on S.aureus and S.mutans at 100 mg/ml; their inhibitory effect differed significantly (P<0.05). The highest inhibitory effect was shown by cold and hot extracts of A.chundra against S. aureus and S.mutans, respectively.  The Lactobacillus sp. was poorly inhibited by the test extracts. The ethanol extracts of T. arjuna, C. sinensis and A. chundra exhibited MIC values ranging from 3.125 mg/ml to 0.78 mg/ml, while the cold extracts of the above plants revealed the range from 6.25 mg/ml to 1.56 mg/ml. The qualitative analysis of phytochemicals stated that terpenoids, tannin, saponin and alkaloids were present in all tested plant extracts and greater attention was found in bark extracts of T.arjuna. The study confirmed the inhibitory effects of the selected traditional plant sources against oral bacterial isolates.