Dentistry is a branch of medicine that is involved in the study, diagnosis, prevention, and treatment of diseases, disorders and conditions of the oral cavity, commonly in the dentition but also the oral mucosa, and of adjacent and related structures and tissues, particularly in the maxillofacial (jaw and facial) area.

The orthodontist who treated one of our sons was a DDS.  She also had an MS degree in dentistry. 

Two quotes from the internet:

"The goal of the Master of Science program of the College of Dental Medicine is to provide advanced training in research and research methodology to students, primarily those enrolled in one of … Read more