Smith stain color chart8/1/2023 ![]() ![]() Extrinsic discoloration is deposited on the tooth surface or in the acquired pellicle. The causes of tooth discoloration are classified according to the location of the stain and are divided into extrinsic, intrinsic, or internalized. Factors such as dietary habits, socioeconomic status, and iron supplementation may be contributing to the formation of black stain. In patients with black stain saliva has higher calcium concentrations and higher buffering capacity. ![]() Iron/copper and sulfur complexes are thought to be responsible for the dark color. and has lower cariogenic potential than nondiscolored dental plaque. ![]() The microflora of this deposit is dominated by Actinomyces spp. The majority of the authors confirm the correlation between the presence of black stain and lower caries experience. According to the reviewed articles published between 20, the prevalence of black stain varies from 2.4% to 18% with equal sex distribution. Most of the studies concerning this issue were conducted in pediatric population. Over the last century, the etiology of black stain has been the subject of much debate. Black stain is characterized as a dark line or an incomplete coalescence of dark dots localized on the cervical third of the tooth. ![]()
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