BACTERIOLOGYMicrobes in human oral cavity: a reviewSarmah, Rajeeva; Khan, Reyaz A.b; Devi, Kangjam R.cAuthor Information aFaculty of Science (Biotechnology) bFaculty of Science (Microbiology), Assam Down Town University, Guwahati cRegional Medical Research Centre-Indian Council of Medical Research, Dibrugarh, India. Correspondence to Rajeev Sarmah, PhD, Faculty of Science (Biotechnology), Assam Down Town University, Guwahati 781026, Assam, India. E-mail: [email protected] Received 12 February, 2020 Accepted 1 April, 2020 Reviews in Medical Microbiology: April 2021 - Volume 32 - Issue 2 - p 75-82 doi: 10.1097/MRM.0000000000000227 Buy Metrics Abstract The oral cavity being one of the important opening encounter huge number of microorganisms via air, water and food. Some of them establish, grow and multiply, form communities inside the cavity. The selection and growth of these microorganisms depend upon the physiochemical environment in the cavity. Various molecules of the host and resident microorganisms are responsible for the environmental conditions. Literatures indicate that change in this molecular content in the cavity may likely change the microbial communities in it. Therefore, in case of various diseased conditions/changed food habit may invite changes in microorganisms inside the oral cavity. Thus association of certain microorganisms or increased number of certain microorganisms in the oral cavity may be a good indicator for disease diagnosis. Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.