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a: red-brown, b: red-yellow, c: grey, d: red-grey the appearance and perception of a tooth is the result of a complex interaction of factors such as lighting conditions, translucency , opacity , light scattering , gloss and the human eye and brain. [ ] of these, the intrinsic pigmentation of a tooth
teeth of a regular betel chewer in burma extrinsic discolorations are common and have many different causes. [ ] the same range of factors are capable of staining the surface of restorations (e.g., composite fillings, porcelain crowns). [ ] some extrinsic discolorations that are allowed to remain for...
https://en.wikipedia.org/wiki/Tooth_discoloration