Tooth DiscolorationTooth Bleaching AgentsTooth BleachingToothpastesSkin Lightening PreparationsDentifricesCosmeticsSilicic AcidMonophenol MonooxygenaseDental EnamelDentin SensitivityMelaninsDental Devices, Home CareTooth AbrasionColorArbutinPeroxidesToothbrushingHyperpigmentationMouthwashesBleaching AgentsAgaricalesCarbonated BeveragesBoratesPigmentation DisordersSkin PigmentationTobacco ProductsHair ColorPyronesDental DebondingTartratesToothColorimetryPharmaceutical VehiclesCoffeePhotographyUreaOrthodontic AppliancesStomatitisMelanoma, ExperimentalTeaMaterials TestingHairHydrogen PeroxidePlant ExtractsAnalysis of VarianceDrug CombinationsMicroscopy, Electron, ScanningTime FactorsImage Processing, Computer-Assisted