The aim of this work was to evaluate the hormonal influence on periodontal tissues in two moments: premenstrual and preovulatory, in women whose are in the reproductive phase between 18 and 45 years. The sample is composed by 30 women, who were analyzed following the inclusion criteria as: not pregnant women, who are not using contraceptive or other means of hormonal replacement, who were not in the menopause and who did not present systemic diseases. The periodontal exams were accomplished in

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... wo periods: premenstrual and preovulatory, when it was verified bleeding on probing (BOP) and probing depth (PD) indexes. The premenstrual period obtained greater bleeding on probing index when compared with preovulatory period, showing a statistically significant difference. However, in spite of the probing depth measurements have been greater in the premenstrual period (1.684 ± 0.4728) than in the preovulatory one (1.679 ± 0.4749); the differences were not statistically significant. Basing on the results and according to the methodology used, it was possible conclude that the hormonal variation influences on periodontal tissues.