Article: White wine can also make tooth stains darker: U.S. study

White wine can also make tooth stains darker: U.S. study

WASHINGTON, April 1 (Xinhua) -- It has long been known that red wine causes teeth to stain. However, a recent study by New York University dental researchers found that drinking white wine can also increase the potential for teeth to take on dark stains.

The researchers compared two sets of six cow teeth, whose surface closely resembles that of human teeth, and used a spectrophotometer, an instrument that measures color intensities, to evaluate staining levels.

They found that teeth soaked for one hour in white wine before being immersed in black tea had significantly darker stains than

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