Evaluation of Dental Bleaching In-office

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Experimental: Violet LED + CP 35%

20 patients will be submitted to dental bleaching involving the teeth 15-25 and 45 – 35 with carbamide peroxide 35% ( Whiteform – Fórmula & Ação, São Paulo, Brazil) actived with Violet LED 405 nm (Bright Max Whitening, MMO, São Carlos, SP, Brazil) with gingival barrier

Other: dental bleaching

dental bleaching can be achieved with light, light+ peroxide carbamide gel, or only with peroxide carbamide gel