The present study highlights the Bio activities and Pharmacology of Piper nigrum L. (Black Pepper). Piper nigrum L is commonly known as Kali Mirch, Pippali, Milagu Peppercorn, White pepper, Green pepper, Black pepper, and Madagascar pepper longum plant is a deciduous slender aromatic climber. The major source of bioactive constituents in black pepper is present in the fruits. It contains major pungent alkaloid piperine (1-peperoyl piperidine) which is known to possess pharmacological actions. Antimicrobial activity of black pepper evaluated the antibacterial potential of aqueous decoction of Piper nigrum L. (black pepper), against different bacterial isolates from oral cavity of individual volunteers.