Final answer:
The first dental code dates are not provided, but significant milestones in dental history occurred post-Civil War with African American individuals like Robert Tanner Freeman, George Franklin Grant, and Ida Gray Nelson Rollins graduating and breaking barriers in the late 19th century.
Step-by-step explanation:
The first dental code, which could refer to nomenclature for dental diseases and conditions, does not have a specific inception date detailed here. However, we can discuss significant historical events in dentistry. After the Civil War, leaps in the field of dentistry were made when African Americans such as Robert Tanner Freeman and Ida Gray Nelson Rollins made remarkable strides despite racial and gender barriers at the time. Freeman, the son of former slaves, became the first African American to graduate with a doctorate in dental surgery after being admitted to Harvard Dental School in 1867. He graduated in 1869 and went on to practice in Washington, D.C.
Freeman's classmate at Harvard, George Franklin Grant, also left a substantial mark in dental history by becoming Harvard's first Black faculty member and a pioneer in treating patients with congenital cleft palates. Meanwhile, Ida Gray Nelson Rollins followed suit as the first female African American doctor of dentistry, graduating in 1890 from the Ohio College of Dentistry.
While the first dental code is not specified, these events highlight the broader evolution of dentisty within that era.