National Institute of Dental and Craniofacial Research NIH National Institute of Dental Craniofacial rate of tooth loss age have an average of five missing teeth. missing one or more teeth National Institute of Dental and Craniofacial Research 3% of the adult population National Institute of Dental and Craniofacial Research National Institute of Dental and Craniofacial Research decreasing since the 1970s National Institute of Dental and Craniofacial Research National Institute of Dental and Craniofacial Research National Institute of Dental and Craniofacial Research National Institute of Dental and Craniofacial Research National Institute of Dental and Craniofacial Research National Institute of Dental and Craniofacial Research National Institute of Dental and Craniofacial Research