Objective method The color will also be measured with the spectrophotometer Easyshade ( Vita Zahnfabrik, Bad Sackingen, Germany ) according to the CIELab system of Vita. Calibration of equipment will always be made before each measurement, and three measurements for each tooth will be made. The evaluation will be conducted at the same times that the method subjective. For standardize the measuring of color, a mold of the teeth of the upper arch with heavy condensation silicone (Coltoflax profile and cub, Vigodent, Rio de Janeiro will be held, Brazil ) for making a silicone matrix. The matrix was used to standardize the region of the tooth in which the color is measured with the spectrophotometer. The matrix will be drilled in the vestibular region, in the middle third, in the upper teeth, using a scalpel circular 6 mm in diameter, Biopsy punch ( Miltex, York, PA USA), similar diameter to the tip of the spectrophotometer Vita Easyshade. Color recurrence begins the day the patient is bleached, the spectrophotometer used has a sufficient sensitivity to determine minimal color changes, is based on the construction algorithm for the detection of the dimensions h and b color . (Jadad et al. , 2011)