in order for your teeth to whiten with vinegar, peroxide, or baking soda, how long do you keep it in your mout?

is it just the brushing with these items for at least 2 minutes that will whiten, or do you have to soak your mouth for like 10 mins or something...per day, per session?
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What i think is best is what my dentist told me to do brush your teeth with your toothpaste rinse your mouth then, wet your tooth brush and dip it into baking soda brush your teeth and let it sit on for about 3 minutes then rinse it off. if you do it everyday after about a month ull see results!! Good luck
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