As a child, Gemma Boyer loved to pose for pictures, flashing her wide toothy grin. But because she has Sjogren’s syndrome — which dries moisture from the eyes and mouth — her teeth became badly decayed. By her late teens, she no longer wanted to show off her smile. That changed once Dr. Mohamed Kamel, an RSDM professor who also practices with Rutgers Health University Dental Associates, created dentures for her and, later, dental implants.