Since those white strips are so expensive, I wanted to try to make my own. My plan was to get one of those trays that fit in your mouth and you can fill with various substances to whiten teeth. But instead of buying the stuff that goes in there, I would just use my own hydrogen peroxide paste made with baking soda and hydrogen peroxide. I'd just mix them together so that the peroxide stays on my teeth. Does anyone know if that would work? Or if one of those substances either individually or combined would do something bad to my teeth? Or does anyone have any alternate recipes? Thanks.