im confused about whitening my teeth with baking soda!?

so i want to whiten my teeth at home and people told me to use baking soda. so do i put backing soda AND toothpaste on my toothbrush when im brushing or ONLY the baking soda?? im so confused
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Before going to bed use only baking soda to brush your teeth. In the morning you can brush just by your tooth paste.
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