I brushed my teeth with baking soda n peroxide and i ended up with white spots on my gums now im concerned i might have been poisoned by peroxide??

Peroxide burn: It's only temporary over-oxidation\burning\dehydration of the tissue. It will return to normal within a day or so. Speak to your dentist about how to accomplish proper oral hygiene and have clean healthy white teeth.

Peroxide: Not poisoned, but tissues have been damaged. Please consult with your Dentist?/Hygienist about appropriate oral hygiene and a dentifrice that will not cause you harm. And please avoid mixing baking soda and peroxide. Toothpaste is much safer and more effective.