I'm a big fan of the Whitestrips.
Just used the Professional Effects about 2 months ago.

I really liked the results on my top teeth, but my bottom teeth were a lot more stained and I feel like they didn't come out as white as the top did.

Is it really bad to use another box so soon? I'd just do the bottom.

I know the instructions said to do it only once a year- and I know too much whitening is no good- but I just feel like I want to hit the bottom ones again because they are just dingy looking

Anyone piggy back the treatments like that?