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The teeth whitening industry is booming. Everybody wants to brighten their smiles, and there are now more options than ever before—from professional options at the dentist’s office, to over-the-counter toothpaste, to whitening strips, and other products. However, not all products are created equal, and some may have side-effects. So, how can you start a whitening routine at home and keep your teeth safe?

Teeth can become yellow over time, but there are several strategies that you can use to slow down or even reverse the process naturally. In general, teeth become yellow for two reasons: enamel thinning and stains. Enamel is the outer layer of the teeth, and it is colored almost white. Beneath it is a tissue known as dentin, which is yellow-brown in color. When the outer layer of enamel thins, dentin becomes more visible, and the teeth take on a darker color. Enamel can become thinner for a variety of reasons, including aging, acidic foods, and gum disease. Stains will also change the coloring of the teeth, and certain foods, beverages, and products (such as cigarettes and some antibiotics) can cause stains. So, how can you whiten your teeth naturally at home?