Rock decided to transfer into the field of dentistry and, after an 1849 apprenticeship with a Dr. Harbert, a white dentist, opened a dental practice in Philadelphia in January, 1850.
Rock decided to transfer into the field of dentistry. Rock opened a dental practice in Philadelphia in January. This was after an 1849 apprenticeship with a Dr. Harbert. January was 1850. A Dr. Harbert was a white dentist.