title: The influence of oral contraceptive therapy on the periodontium--duration of drug therapy.
mesh_terms: D000293:Adolescent; D000328:Adult; D003276:Contraceptives, Oral / Q000008:administration & dosage / Q000494:pharmacology*; D005260:Female; D005881:Gingiva / Q000187:drug effects*; D005891:Gingivitis / Q000175:diagnosis; D006801:Humans; D010512:Periodontal Index; D013997:Time Factors
chemical_list: D003276:Contraceptives, Oral