Tooth chromophore

Tooth chromophores are organic or inorganic molecules responsible for the visible color and discoloration of dental tissues, including enamel and dentin (Joiner, 2006). These molecules can be extrinsic, originating from dietary sources like coffee, tea, and red wine, or intrinsic, resulting from systemic factors such as tetracycline use, excessive fluoride intake, or metabolic products like bilirubin (Watts & Addy, 2001). In the context of dental therapeutics, these molecules are the primary targets of bleaching agents, most notably hydrogen peroxide and carbamide peroxide (Kwon & Wertz, 2015). These agents work by penetrating the tooth structure and initiating oxidation-reduction reactions that break the conjugated double bonds within the chromophores, effectively decolorizing them or reducing their molecular size to allow for diffusion out of the tooth (Dahl & Pallesen, 2003). While not biological receptors or enzymes, their modification is the central goal of cosmetic and restorative dentistry to treat conditions like dental fluorosis and age-related yellowing. The chemical degradation of these pigments is often monitored using standardized shade guides or spectrophotometry to assess treatment efficacy (Joiner, 2004). Understanding the interaction between oxidizing agents and these chromophores is critical for minimizing common side effects such as transient dentin hypersensitivity and gingival irritation (Carey, 2014).

Other names

Tooth chromophore moleculesDental chromophoreTooth pigmentExtrinsic stainIntrinsic stain

Oxidation of conjugated double bonds within the chromophore structure to produce smaller, less pigmented molecules (Joiner, 2006; Kwon & Wertz, 2015).