Organic dental chromophore

Organic chromophores and pigmented organic components in enamel, dentin, and the acquired pellicle or plaque are the primary chemical targets for dental whitening procedures (Joiner, 2006). These substances include a variety of complex organic molecules such as polyphenols, carotenoids, and porphyrins that accumulate over time from dietary sources, tobacco use, or bacterial metabolic products (Kwon & Wertz, 2015). In the dentin, intrinsic staining can also result from systemic factors like tetracycline administration or excessive fluoride during tooth development (Epple et al., 2019). Dental bleaching agents, primarily peroxides, work by penetrating the tooth structure and releasing reactive oxygen species that oxidize the conjugated double bonds within these chromophores (Kwon & Wertz, 2015). This oxidative process breaks down the large, pigmented molecules into smaller, colorless, or less-pigmented fragments, thereby increasing the lightness and reducing the yellowness of the teeth (Joiner, 2006). While effective for aesthetic improvement, targeting these components can lead to therapeutic challenges such as transient dentin hypersensitivity and soft tissue irritation due to the diffusion of peroxide into the pulp chamber or contact with the gingiva (Epple et al., 2019). The efficacy of these treatments is typically monitored using standardized shade guides or spectrophotometric analysis of color coordinates (Joiner, 2006).

Other names

Dental chromophoresExtrinsic stainsIntrinsic stainsTooth pigmentsPellicle pigmentsOrganic dental stains

Oxidation of conjugated double bonds in organic pigments by reactive oxygen species, leading to molecular fragmentation and decolorization (Kwon & Wertz, 2015).