ROOT RESORPTION IS REPORTED as a microscopic finding in trials attempt
ing to regenerate the periodontium using tetracycline or citric acid r
oot conditioning. This report deals with a case of progressive cervica
l root resorption in a female patient who had been successfully treate
d by tetracycline root conditioning, The article emphasizes the possib
ility of this adverse effect, and discusses a possible mechanism induc
ing this phenomenon.