Welcome to Manatee Endodontics. Dr. Joseph L. DeJongh graduated with a Doctor of Dental Medicine (D.M.D.) degree, cum laude, in 2005 from the University of Florida. he completed his endodontic training at the University of Florida, earning an M.S. in Oral Biology and Certificate in Endodontics in 2008. He is a past president of the Manatee County Dental Society.