Methods: 30 health adults who received either placebo or ibuprofen. The drugs were administered 1 hour prior to the bleaching and will be prescribed 5 doses every 8 hours during 48 hours. For bleaching will be used 35% hydrogen peroxide gel. The tooth sensitivity will be recorded for up and lower arc on two scales: VAS (visual analogic scale) and 0-4. The shade evaluation will be performed before and 30 days after bleaching with visual shade guide and spectrophotometer.