A cavity is a small dental infection of the tooth that is comprised of bacteria and is treated with a filling. Discover how a dentist fills a cavity by numbing the patient, cleaning the cavity and filling it with tips from a dentist in this free video on dental health and oral hygiene. Expert: Dr. Mike Glasmeier Contact: www.nashvillefirstimpressions.net Bio: Dr. Mike Glasmeier is a member of the American Dental Association. Filmmaker: Dimitri LaBarge