Periodontal disease and oral hygiene. Described by Antoni van Leeuwenhoek.
D001419:Bacteria / Q000166:cytology; D049670:History, 17th Century; D049671:History, 18th Century; D006801:Humans; D009910:Oral Hygiene; D010510:Periodontal Diseases / Q000266:history* / Q000382:microbiology / Q000517:prevention & control