Tooth Bleaching Whitening

I was looking into purchasing the product 5 minute whitening gel soon..

But, i broke my tooth a few years back, and i got it replaced with a filling/crown, pretty much like a false tooth, all though my whole tooth didn't break, just half of it.

So i was wondering if anybody knew weather using this product would change the color of the real part of my tooth but not the false part, or if it would change the whole tooth's color. Please help! Thank you!