Tooth Color Science
Understanding the factors that determine natural tooth shade and appearance.
Tooth color is determined by the interaction of three optical properties: hue (basic color — yellowish, reddish, grayish), chroma (color saturation/intensity), and value (lightness/darkness, the most critical factor in shade matching). The dentin layer primarily determines tooth color, while enamel affects translucency and surface characteristics. Natural teeth are not uniform in color — they are typically darker at the cervical (gum) area, lighter in the middle third, and more translucent at the incisal edge. Teeth naturally darken with age as enamel thins and dentin thickens. Factors affecting color include genetics, diet (coffee, tea, wine), tobacco, medications (tetracycline), fluorosis, and trauma. Understanding these properties is essential for shade matching in restorations and predicting whitening outcomes.