Those concerned about maintaining a white smile may choose to cut back on well-known staining culprits like coffee and red wine, but surprisingly, white wine may be to blame for stains, too.
In a new study, researchers dipped cow teeth (similar in surface to human teeth) in white wine for an hour to mimic the effect of sipping wine with dinner. They then immersed the teeth in black tea. Compared to teeth that had been dipped in water before tea, the wine-soaked teeth were significantly darker.
Although red wine is still the bigger stainer (due to chromogen), white wine contains acids that create rough, penetrable grooves in the tooth’s surface. This allows subsequent darker beverages to seep in and stain.
The study authors say it’s not necessary to stop drinking your favorite wine as long as you use a whitening toothpaste every day. You may also want to avoid an after-dinner coffee or tea if you’ve made your teeth more susceptible to stains by drinking white wine throughout the meal.
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