Orthodontics and dentofacial orthopedics - The straightening of teeth and modification of midface and mandibular growth. Periodontics (also periodontology) - Study and treatment of diseases of the periodontium (non-surgical and surgical) as well as placement and maintenance of dental implants Pediatric dentistry (formerly pedodontics) - Dentistry limited to child patients Prosthodontics - Dentures, bridges and the restoration of implants. Some prosthodontists further their training in "oral and maxillofacial prosthodontics", which is the discipline concerned with the replacement of missing facial structures, such as ears, eyes, noses, etc.