Charles Cassidy Bass (January 29, 1875 – August 1975) was an American medical doctor and researcher on tropical medicine who made significant contributions to understanding malaria, hookworm, and other diseases. Later Bass studied the relationship between dental health and general well-being. Bass articulated and promoted the "Bass Technique of Toothbrushing" and developed improved means of flossing teeth, for which some refer to Bass as "The Father of Preventive Dentistry". He subsequently became a university administrator, serving as dean of the Tulane University School of Medicine, from 1922 to 1940.