Study intervention
tooth
One week before initiating the treatment, all participants received dental prophylaxis with rubber cups and pumice. In this session, a matrix was created for each participant using condensation silicone (Coltoflax and Perfil Cub; Vigodent, Rio de Janeiro, RJ, Brazil) to standardize the area of color measurement. In the matrix, a circular window was performed in the buccal surface of each tooth. It was configured using a circular metal cutting device measuring 6 mm in diameter (Biopsy Punch (Miltex, York, Pensilvania, USA), corresponding to the diameter of the spectrophotometer device (Easyshade Advance 4.0; Vident, Brea, CA, USA) [