Dr. Philip Gentry December 2019 vs December 2020 January 1, 2021teaching at university of maryland dental schoolarlington, best dentist, dental, dentist, dentistry, Dr Gentry, Dr. Philip Gentry, northern virginia, Philip Gentry, PPE, top dentist, virginiaDr. Philip Gentry, DDS Dr Philip Gentry Dr. Gentry before and during covid in clinic at The University of Maryland Dental School