Effectiveness of 16% Carbamide Peroxide in Reducing Hypersensitivity During Alternate-day Home Bleaching

Inclusion Criteria: * Patients older than 18 years. * Patients with vital teeth without restorations, single crowns, implants and/or bridges at the level of the anterior teeth. * Absence of cavities in the teeth to be whitened. * Patients with satisfactory oral hygiene and periodontally healthy, who are not undergoing periodontal maintenance and who do not use chlorhexidine mouthwashes. Patients with recessions without presenting sensitivity will be included. * Absence of sensitivity, measured with the application of air with the dental team's syringe. * Patients whose canines have at least an A2-A3 shade (VITA Classic® Guide). Exclusion Criteria: * Patients who have previously undergone whitening (less than 5 years). * Patients undergoing orthodontic treatment. * Patients with white spots or alterations in the development of enamel or with stains. * Patients with a history of trauma to anterior teeth. * Patients who require internal whitening. * Smokers. * Pregnant or lactating. * Patients with allergies to any whitening component. * Patients presenting alterations of the oral mucosa (desquamative gingivitis, oral lichen planus, leukoplakia, etc.). * Patients with medical conditions considered by the researchers that may compromise the study or the individual safety of the patient. * Patients with poor oral hygiene. * Patients with previous hypersensitivity.