Inclusion Criteria:  Individuals with at least 18 years of age, without loss of proximal clinical insertion, with papilla completely filling the interdental space and with at least 24 teeth will be eligible.  Individuals should present gingivitis in 15% of the proximal sites (gingival marginal bleeding, gingival index score 2, LÖE, 1967). Distal sites of the posterior teeth will not be counted in the analysis because they are not areas of flossing.  Exclusion Criteria:  Dental students, individuals with xerostomia, pregnant women, diabetics, smokers, patients with orthodontic appliances and/or containment, individuals requiring antimicrobial prophylaxis to perform oral exams; who have used antibiotics/anti-inflammatories for the last three months and who have psychomotor disorders.