The residual calculus paradox.
Robertson
P B
PB
D000818:Animals; D003728:Dental Calculus / Q000150:complications* / Q000601:surgery; D003777:Dental Prophylaxis; D012534:Dental Scaling; D004285:Dogs; D004846:Epithelial Attachment / Q000473:pathology; D006801:Humans; D010518:Periodontitis / Q000209:etiology* / Q000601:surgery; D010685:Philosophy, Dental; D014092:Tooth Root / Q000601:surgery*