Tooth enamel chromogenic molecule

Tooth enamel chromogenic molecules are chemical substances responsible for the extrinsic discoloration of teeth, often originating from dietary sources, tobacco, or microbial activity. These molecules, which include tannins, polyphenols, and melanoidins, adhere to the acquired dental pellicle or penetrate the porous structure of the enamel hydroxyapatite (Watts & Addy, 2001). They are characterized by complex structures containing chromophores—chemical groups that absorb visible light and produce color. In the context of dental therapeutics, these molecules are the primary targets for oxidative bleaching agents such as hydrogen peroxide and carbamide peroxide (Joiner, 2006). These agents release reactive oxygen species that attack the double bonds within the chromophores, breaking them down into smaller, colorless, and more soluble components (Epple et al., 2019). While these molecules do not perform a physiological function in the human body, their accumulation is a significant aesthetic concern and a driver for professional and over-the-counter dental treatments.

Other names

Extrinsic dental stainChromogenDental pigmentTooth discolorantExogenous dental pigment

Oxidative degradation of chromophores through the release of reactive oxygen species and chelation of metal-mediated stain complexes (Joiner, 2006; Watts & Addy, 2001).