Pigment molecules in teeth and tissue

Pigment molecules in teeth and tissue represent a group of chemical species, primarily organic molecules, responsible for the coloration of dental hard tissues such as enamel and dentin. Endogenous chromophores reside mainly in dentin, contributing to its yellowish hue, while external pigments—from food, drinks, tobacco, or restorative materials—can accumulate in the microstructure of enamel and dentin, forming stains[3][10]. Natural pigments may include melanin, hemoglobin derivatives, and carotenoids, while exogenous ones involve tannins, food dyes, and metal compounds. Cosmetic dentistry uses oxidative agents such as hydrogen peroxide to break down dental chromophores through oxidation, fragmenting the larger pigmented molecules into smaller, non-chromogenic substances that diffuse out, restoring a whiter appearance[3]. Although these pigment molecules are clinically important for aesthetics and diagnosis, they do not fit the definition of a therapeutic target, receptor, enzyme, or transporter. If targeting pigmentation for whitening or research, a more specific entry should be used such as “dentin chromophores” or the specific stain molecule. The term here is not precise or canonical in the sense required for structured drug target databases, and should be refined or split into discrete entries as appropriate.

Other names

Chromophores in dentinDental stainsTooth pigmentsOrganic color molecules in teethExogenous dental pigment

Oxidative breakdown of chromophore bonds (hydrogen peroxide and related agents fragment large color molecules into smaller, less pigmented units, which then diffuse out of tissue)