How do i whiten teeth using baking soda?

ok so i looked throught the questions on yahoo and so far i have found the best and easiest way for me to whiten teeth is to use baking soda. ok so i was wondering how i do it because i am not sure. if u know another way plz tell me what to use (i saw 1 that says lemon juice) but i want home made remedies not... show more ok so i looked throught the questions on yahoo and so far i have found the best and easiest way for me to whiten teeth is to use baking soda. ok so i was wondering how i do it because i am not sure. if u know another way plz tell me what to use (i saw 1 that says lemon juice) but i want home made remedies not purchased stuff.

oh p.s i think my teeth are stained because i havent always had yellowish teeth (for about a year now)
Update: oh and what is peroxide and can u get it just from supermarket
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