original_query: What is Charles Edmund Kells Jr. known for in the field of dentistry?
query: What is Charles Edmund Kells Jr. known for in the field of dentistry?
answer: Charles Edmund Kells Jr. is known as "the father of dental radiography" for introducing dental X-rays in the United States. He also hired the first female dental assistant, had one of the first electrically powered dental offices, and invented several dental and electrical devices.