The perception of tooth colour is multi-factorial. 6.4 Return to original pre-treatment shade.3.1.2 Nanoparticle catalysts for reduced hydrogen peroxide concentration.Time exposure and the concentration of the bleaching compound, determines the tooth whitening endpoint. For whitening treatment to be successful, dental professionals ( dental hygienist or dentist) should correctly diagnose the type, intensity and location of the tooth discolouration. There are different products available on the market to remove stains. Reflecting less light, these smaller molecules create a "whitening effect". In the spaces between the inorganic salts in tooth enamel, these unstable free radicals attach to organic pigment molecules resulting in small, less heavily pigmented components. When it diffuses into the tooth, hydrogen peroxide acts as an oxidising agent that breaks down to produce unstable free radicals. Hydrogen peroxide is analogous to carbamide peroxide as it is released when the stable complex is in contact with water. ΔΆ) is the active ingredient most commonly used in whitening products and is delivered as either hydrogen peroxide or carbamide peroxide. The chemical degradation of the chromogens within or on the tooth is termed as bleaching. Whitening is often desirable when teeth become yellowed over time for a number of reasons, and can be achieved by changing the intrinsic or extrinsic color of the tooth enamel. Tooth whitening or tooth bleaching is the process of lightening the color of human teeth. Accidental ingestion of 35% hydrogen peroxide, Canadian Journal of Gastroenterology, US National Library of Medicine, National Institutes of Health.Figure 1.Hydrogen peroxide poisoning, Toxicological Reviews, US National Library of Medicine, National Institutes of Health.Tooth Whitening/Bleaching: Treatment Considerations for Dentists and Their Patients, American Dental Association.Safety Issues Relating to the Use of Hydrogen Peroxide in Dentistry, Australian Dental Journal, US National Library of Medicine, National Institutes of Health.
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