The chemical in toothpaste and other
tooth-whitening products is usually hydrogen
peroxide. Hydrogen peroxide is a bleaching agent,
and is mostly safe when it's dilute (although you
still don't want more than a tiny bit getting
swallowed). Some toothpastes combine hydrogen
peroxide and baking soda.
You could compare toothpastes that contain
hydrogen peroxide with those that don't (probably
some of the 'natural' brands), and you can also
try using just plain peroxide and just plain
baking soda/water to see how the individual
ingredients contribute to the whitening.
You'll probably want to compare the treatments on
something that's not your mouth for a controlled
scientific study. :) As an idea, you can brush a
set of coffee-stained mugs and compare before and
after photos to see which treatment removed the
most stains. Good luck with the project!
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