Zheng Xu, DDS, MDS, PhD, is a clinical associate professor of pediatric dentistry at the University of Washington School of Dentistry in Seattle. Her research interests include infant oral health, craniofacial/dental development and anomalies, dental care in children with special needs, pulp biology, and prevention and treatment of dental trauma. Xu is also a consultant for the American Board of Pediatric Dentistry and an editorial board member for Pediatric Dentistry, the official journal of the American Academy of Pediatric Dentistry. She can be reached at: xuz99@uw.edu.