Inclusion Criteria:  individuals aged 18 to 29 years of both sexes with chroma greater than A2 in the upper incisors and canines, in the Vita Classical color scale; absence of active caries lesions patients who had never undergone bleaching therapy; good oral hygiene and no hypersensitivity to tactile and evaporative stimuli through the Visual Analog Pain Scale;  Exclusion Criteria:  patients undergoing fixed orthodontic treatment; patients with darkened non-vital teeth and/or with extensive restorations in molars; presence of cracks or fractures; patients allergic to the product, with the presence of gastroesophageal disorders and with dentinal exposure in anterior and/or posterior teeth.