What do the initials pa and ms stand for behind a dentist name?

PA stands for Physician's Assistant. Physician assistants are medical professionals who are licensed to practice medicine under the supervision of a physician. They can perform many of the same tasks as a physician, including diagnosing and treating illnesses, prescribing medication, and performing surgery.

MS stands for Master of Science. A Master of Science degree is a postgraduate degree that typically takes two years to complete. It is a research-based degree that requires students to complete a thesis or dissertation.