Whitening treatments can be effective on both extrinsic and intrinsic staining. Only natural teeth can be whitened, not tooth-colored restorations. Whitening treatments include in-office bleaching procedures, dentist-supplied products for use at home, and over-the-counter (OTC) whiteners. Carbamide peroxide and hydrogen peroxide are commonly used in whitening interventions and can readily permeate dental hard tissues. Temporary tooth sensitivity and gingival inflammation are the most common adverse effects of vital tooth whitening.