Red and white wine are both culprits that can stain your teeth's enamel.
Chromogens, which are pigmented molecules found in food and beverages, can stain your teeth. Acidity can contribute to discoloration because it can erode your teeth's enamel and enable chromogens to adhere.
Tannins also increase staining by chromogens.
Source:
Foods and Habits That Stain Your Teeth
http://www.webmd.com/oral-health/features/foods-stain-teeth-feature
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