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. Author manuscript; available in PMC: 2015 Jun 1.
Published in final edited form as: J Evid Based Dent Pract. 2014 Feb 13;14 Suppl:70–76. doi: 10.1016/j.jebdp.2014.02.006

Figure 2.

Figure 2

Chemistry of chromogen bleaching. A. β-carotene is an example of an organic chromogen with many conjugated double bonds; B. Chemical reaction of hydrogen peroxide with a chromogen double bond; and C. Chemical reaction of sodium hypochlorite with a chromogen double bond.