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Tetracycline Tooth Staining
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Description
Tetracycline can stain the teeth anywhere from a bright yellow shade to dark brown.  Usually the staining starts out as a yellow color.  Over time, as the tooth is exposed to light, a chemical reaction occurs and the yellow turns to a dark brown color.  For this reason, many people with tetracycline tooth staining have brown teeth in front (the teeth that are exposed to the most light) and yellow teeth in the back (where not as much light reaches.)  Under ultraviolet light, tetracycline staining can appear bright yellow.
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