Several household items can be used to whiten teeth, including baking soda and hydrogen peroxide, apple cider vinegar, coconut oil and lemon or orange peels, according to DrAxe.com. The best way to whiten teeth is to brush and floss daily, stop drinking coffee and tea and eating sugary foods, eat a healthy diet that supports strong bones, teeth and gums and stop smoking.
Brushing the teeth with a mixture of baking soda and hydrogen peroxide is a good whitening technique, and has added anti-bacterial benefits as well. Coconut oil applied to the teeth after brushing is another good natural solution. Rubbing lemon or orange peel on the teeth whitens them, as does apple cider vinegar, but the acidity might harm the enamel. It's a good idea to always rinse well after using citrus peel, and to brush teeth again after applying apple cider vinegar.