I saw a really simple way to whiten teeth with a homemade paste using hydrogen peroxide and baking soda. I'm not saying I'd intentionally swallow any of it but I want to know how dangerous it is putting a poison like that in my mouth for a few minutes every so often. Is it worth the results? Does it really work?
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It works but it also does harm to your enamel and your gum. The baking soda will scratch your enamel and the peroxide will turn your gums white and will cause them to recede. If you think its worth it then go ahead.
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