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Department of Conservative Dentistry and Endodontics conducted a guest lecture on “Dental Caries Bacteriology and Treatment Options” presented by Dr. V. Keerthi, Reader, Dept of Conservative Dentistry and Endodontics, Thai Mookambigai Dental College on 4.1.19 at Watson and Crick Hall, Saveetha Dental College. Dental caries is a bacteria driven disease. The microbiota is highly complex and varies with caries initiation to progression based on different caries sites. There are various methods to detect microorganisms associated with different stages of caries with the latest being technology of molecular analyses. The lecture focused on the bacterial diversity and medical model for prevention of dental caries.