What Is Tooth Discoloration? Tooth discoloration can happen due to staining on the surface or due to changes in the tooth. Different types of tooth discoloration are: External It occurs when the enamel (the outside layer of the tooth) gets stained. Wine, caffeine, cola or other drinks or foods can cause staining of teeth. Smoking also causes external staining of teeth. Internal It happens when dentin (the inner structure of the tooth) gets a yellow tint or darkens. This type of discoloration is possible due to factors such as: During early childhood, you had excessive exposure to fluoride. During the second half of pregnancy, your mother used tetracycline antibiotics. You were eight years old or younger when you used tetracycline antibiotics. You suffered trauma that affected a tooth when you were a young child. For example, an accidental fall can damage the still-developing permanent tooth. You suffered trauma in one or more permanent teeth, and interna...
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