You may have noticed that some dentists have different letters at the end of their names. For example, Dr. Abelar’s title is "Martin P. Abelar, DDS." You may have also noticed other dentists who have the letters DMD at the end of their name. So, what’s the difference between DDS and DMD? And while we’re on the subject, what’s the difference between a dentist, periodontist, orthodontist and maxillofacial surgeon? Or between a dental hygienist and a dental assistant? Is one more qualified than the other? Here’s the lowdown on the differences in titles and abbreviations in dentistry.