You may be able to whiten your teeth at home naturally using products you can find in the grocery store. However, the science behind these methods is lacking.
If you want whiter teeth but also want to avoid the chemicals, this article lists many options that are both natural and safe.
“Teeth can appear yellow for various reasons, but a range of strategies can slow the process and may reverse it. Tips for getting white teeth range from avoiding certain foods to occasional brushing with baking soda and hydrogen peroxide.”
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