The fastest and cheapest way to whiten your teeth and keep your breath fresh is to brush with baking soda. I had nicotined stained teeth, and have been using just plain baking soda for two months now and my teeth are whiter than they've ever been!
I heard that if you swish peroxide in your mouth for 5 minutes everyday, within a week your teeth will be whiter. I've seen a big difference in my teeth. A friend uses it & it has totally cleared up her very bad breath that she was plagued with for years.
My dentist suggested using the hydrogen peroxide because it is a lot cheaper ... also the label says: for use as a gargle & rinse on the bottle.
I am not familiar with benzoyl peroxide. Check with your dentist if you are in doubt.
I leave a small residue of toothpast in my mouth after brushing and add just a little bit of peroxide and it foams up ... you may have to spit some of the foam out. Keep it in your mouth for a minute, then rinse.
I use it as mouthwash every day, just gargle with it. I use to buy the expensive teeth whitteners until I heard about this and not I use it every day. It works great, I drink sodas all day and still have white pretty teeth!!
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