Peroxide and baking soda at home teeth whitening?

So I tried the hydrogen peroxide and baking soda mixture for a little at home teeth whitening. I mixed it up to the proper consistency and applied to my toothbrush and gently started rubbing the mixture across my teeth. After about 10 seconds it started to burn my gums wildly. So I rinsed my mouth and spit it out.... show more So I tried the hydrogen peroxide and baking soda mixture for a little at home teeth whitening. I mixed it up to the proper consistency and applied to my toothbrush and gently started rubbing the mixture across my teeth. After about 10 seconds it started to burn my gums wildly. So I rinsed my mouth and spit it out. Now my gums around the base of my teeth are a swollen, chalky white. What the hell just happened? Did I do something wrong or is it just a reaction my body had?
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