Restorative dentistry includes crowns and bridges. Cosmetic dentistry is purely esthetic.
Prosthetic dentistry includes dentures and partials.
Pediatric dentistry includes all services defined in the 'general practice' category, for children. Orthodontics deals with problems in the alignment of teeth and jaws. Endodontics means, root canals. Periodontics refers to your gums. Oral surgery includes extractions.