A Dental Home for Children in Southern Maryland!Welcome to Smile Castle Pediatric Dentistry. Our dedicated team is proud to be treating the smiles of Southern Maryland's Children. We provide a full range of routine and complex dental procedures in a child friendly environment. As a board-certified pediatric dentist, Dr. Hwang focuses on preventive care and education to help each child grow a healthy smile that will last a lifetime. Our office serves infants, children, teens and persons with special health care needs in St. Mary's County, Calvert County, Charles County and surrounding areas.