Which foods and drinks reduce the effectiveness of the whitening process?

Foods and drinks that reduce the effectiveness of teeth whitening include coffee, tea, red wine, dark-colored beverages like cola, acidic fruits, sodas, vinegar, and acidic sauces. Sugary foods can also promote bacterial growth and yellow teeth. Dark sauces like soy sauce, tomato sauce, and curry also stain teeth. Smoking also causes tooth discoloration. Avoiding these foods and drinks after whitening helps maintain the results.