This gel reduces pain or discomfort, and also returns all lost minerals and vitamins during the bleaching process. Another thing we liked was the lack of pain. One thing you can do is avoid the following five dark-colored foods and beverages, to prevent tooth staining. Tomato sauces, stews, soy and marinades all can cause significant staining. Use of whitening strips can cause tooth sensitivity or irritation of the gums. Avoiding tobacco products and foods and drinks that are likely to stain your teeth is crucial to preserving your teeth whitening results. Over the counter products can provide you with results. However, some customers experience lighter SuperBrite 3D Teeth Whitening and are happy with their results. The key to getting the best results during your teeth whitening experience is to ensure that each of your teeth maintain a consistent and even coverage for a period of time. Ahead, behold the before-and-after results of everything from classic Crest Whitestrips to coconut oil-pulling and even a bottle of mouthwash that all claim to brighten your pearly whites.