ORIENTAL JOURNAL OF CHEMISTRY www.orientjchem.org An International Open Free Access, Peer Reviewed Research Journal ISSN: 0970-020 X CODEN: OJCHEG 2017, Vol. 33, No.(5): Pg. 2566-2572 Physicochemical Characteristics of Toothpastes and Natural Powder and their Antibacterial Activity against Viridans Streptococci Bacteria KARZAN A. OMAR 1 *, AWARA K. ISMAIL 2 , CHNAR. M. AMIN 1 , MARDIN. S. JALAL 1 , SEBAR. N. QADR 1 and ZAYNAB. F. RAFIQ 1 1 Department of Chemistry, Faculty of Science and Health, Koya University, University Park, Danielle Mitterrand Boulevard, Koya KOY45, Kurdistan Region of F.R. Iraq. 2 Department of Biology, Faculty of Science and Health, Koya University, University Park, Danielle Mitterrand Boulevard, Koya KOY45, Kurdistan Region of F.R. Iraq. *Corresponding author E-mail: karzan.abdulkareem@koyauniversity.org http://dx.doi.org/10.13005/ojc/330553 (Received: May 13, 2017; Accepted: August 05 , 2017) ABSTRACT The Physicochemical characteristics of several kinds of toothpaste and natural powder samples and their antibacterial activity against Viridans streptococci bacteria have been studied in vitro. The Physicochemical analysis such as pH, conductivity, and moisture and fluoride concentration of the toothpaste and natural powder along with X-Ray Diffraction made in the consideration to indicating the quality of toothpaste and natural powder products. The results of the Physicochemical properties revealed the differences between toothpaste and natural powder samples. The toothpaste samples exhibited very good antibacterial activities against Viridans streptococci bacteria in comparison to the natural powder almost have no activity against bacteria Keywords: Toothpaste, Natural powder, Physicochemical properties, Viridans streptococci. INTRODUCTION Toothpaste is one of important care products which are necessary for healthy teeth and oral hygiene. Toothpaste was made for teeth cleaning and protecting the mouth from oral microorganism. The ingredient in toothpaste been improved by adding antimicrobial agents such as zinc oxide, titanium oxide, tin oxide and their composites 1 to eliminate and inhibit microbial growing which mostly causes for tooth decay and other oral diseases 2 . Also, fluoride is one of the most significant active ingredients in the toothpaste have the effective ability to clean and deciduous teeth 3 . In the dental care fluoride working under the mechanism to inhibiting carbohydrate fermentation by bacteria in the oral cavity and preventing aggregation of bacteria by disrupting their cell walls and inhibiting their enzymatic activity 4,5 . The commercial toothpaste contains different