Abstract
Objectives: The aim of this study is to compare the effectiveness of whitening mouthrinses on teeth previously whitened or not, exposed to food dyes. Material and Methods: Ninety specimens of enamel and dentin of 3 mm in diameter will be obtained from bovine incisors. The specimens will be stained for 14 days in broth staining. After staining, the specimens will be embedded in resin flow …