Mix baking soda and hydrogen peroxide
Make your own whitening paste by mixing a small amount of baking soda with a small amount of hydrogen peroxide (this is what dentists use to clean your teeth, but you can buy it over-the-counter at drugstores). The paste should be pretty runny. If it’s too gritty, that means there’s too much baking soda, and you could scrub off your enamel. Here’s how you can whiten your teeth with natural ingredients from home.
Estafan says that a splash of milk can make a real difference for your teeth. A study published in the International Journal of Dental Hygiene found that casein, the main protein in milk, can latch onto tannins in tea (bitter-tasting particles that leave residue on teeth) and prevent staining. In fact, Ava Chow, the lead researcher in this study, says it may work even better than whitening toothpaste. Coffee also has small amounts of tannins, so coffee drinkers can reap these dairy benefits too. For the best results, use high fat animal milk; soy milk won’t do the job.
Sip water between cups of coffee
A swig of water can wash away staining liquids quickly before they start to set into your teeth. Even though science shows coffee isn’t dehydrating, this is still a great way to stay hydrated throughout the day.