White teeth from?
You're not getting the white teeth from drinking green tea, you're getting the whiter teeth from NOT drinking coffee which stains teeth (as does regular tea... the tannins in the tea, and the coffee stain actually stain the teeth. Tannic acid is used in leather production, also.)
So the whiter teeth is not from any substance in the green tea, but from the absense of the staining stuff in coffee and regular black teas (or orange pekoe, or earl grey, or whatever regular teas) you were drinking.
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