Never buy white strips again! Dip a Q-tip in hydrogen peroxide (the key ingredient in whitestrips) and apply to surface of teeth for 30 sec before brushing teeth once a day for a few days.
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Another pinner wrote: After being in dentistry for 20 years.. Let me tell you a cheap secret. All tooth whitening is made of peroxide. The gels run from 6 percent peroxide to 32 percent peroxide. If you swish with hydrogen peroxide everyday you will have the same results plus excellent gum tissue! As a dental hygienist, I recommend swishing with peroxide for 1-2 minutes morning and night to all my patients.
HOW TO MAKE YOUR TEETH 'SNOW WHITE' -Put a tiny bit of toothpaste into a small cup, mix in one teaspoon baking soda plus one teaspoon of hydrogen peroxide (3%), and half a teaspoon water. Thoroughly mix then brush your teeth for two minutes. Remember to do it once a week until you have reached the results you want. Once your teeth are good and white, limit yourself to using the whitening treatment once every month or two.