Any item which stains a white shirt can stain your teeth for 24 hours after the teeth whitening procedure. Such foods should be avoided.
1. Colored liquids: Tea, coffee, red wine, cola and tomato juice.
2. Acidic Beverages: Soft drinks, fruit juices and alcohol in general.
3. Foods with natural or added colorants: Soya sauce, ketchup and turmeric based curries.