My senior picture is next Tuesday, how do I whiten my teeth?

At stores they sell this product from Arm & Hammer, it has baking soda in it and you are supposed to put it over your tooth paste and brush your teeth, to help whiten them. Ive tried it and it worked a little but I think it works best when you just used plain and simple, baking soda. Just put some of the powder on your tooth brush and brush your teeth normally, and after wards i would just brush with my normal toothpaste so my mouth wouldnt feel all weird.