Article in English: While you may be trying to avoid a costly trip to the dentist, you may end up spending more in the long run — and causing yourself a considerable amount of pain — if you try something that damages your teeth or gums. Even just a call to your dentist's office to verify the safety of your chosen at-home method is a good idea. Whitening your teeth at home without a consultation with your dentist is risky and could damage your teeth or mouth. Put some toothpaste on a toothbrush and then sprinkle some baking soda on it. Brush your teeth with this. Baking soda helps to remove the stains from the enamel, which is the outermost layer of the tooth. Do this step regularly, and you'll be on your way to having those Pearly Whites for the rest of your life! Mix baking soda and hydrogen peroxide to form a sort of "toothpaste." Brush your teeth with this paste, but not too often. Use 3% hydrogen peroxide in your mixture. Hydrogen peroxide is the active ingredient in many over-the-counter teeth-whitening remedies. It functions by the process of "oxidation," which is a chemical reaction that helps to whiten teeth. There is a substance called "lauric acid" found in coconut oil; this can help to prevent bacteria-induced discoloration of the teeth. It may sound unpleasant, but the taste is actually not too bad when you try it!

Summary in Vietnamese:
Trao đổi với bác sĩ nha khoa trước khi thử các biện pháp làm trắng răng tại nhà. Làm trắng răng với muối nở. Làm trắng răng bằng ôxy già. Xúc miệng bằng dầu dừa trong khoảng 10-15 phút.