58 patients between 18 and 76 years who attended the Operative Dentistry Clinic at Dental
School, Universidad de Chile, were included in the study. Those patients were bleaching and
included in this study and signed a consent form. The patients were treated with 10%
carbamide peroxide (CP) gel (Whiteness Perfect, FGM) to each subject with verbal instructions
for 3 weeks with daily applications of 1 hour according to manufacturers indications , before
and after this procedure was applied again the OHIP-Esthetics , PIDAQ and OES questionnaire
form, had 30 minutes to answer it, were completed before , immediately after and one month
control post-bleaching procedure.