Smile: Aquafresh White Trays

I've tried a few whitening agents without much success, until now.
Aqua Fresh White Trays :: $40 CVS
I noticed a difference. My teeth were ok before, just, well, a little off-white. Possibly on the slightly yellow-ish side if we're being totally honest.
The only problem I had was the same with Crest White Strips. Even just once a day instead of twice, I missed a day because I was out running a bunch of errands and I didn't have 30-45 minutes to sit around with two trays of whitening gel in my mouth.
It was much worse with the other brand of strips; I have no idea if they work or not because I used them so sporadically. I just could not find twice a day where I could spend half an hour without talking, eating or smoking crack. Kidding -- I've never smoked crack. Crack is whack! And also very bad for your teeth.
All this week I've noticed my teeth seemed brighter and whiter. I only skipped one day. I don't think that made a big difference. They're expensive, more than I'd like to spend, but after a week (or so) there is a noted change. With still one treatment left, I'd buy them again to get my grill going really super bright.
Wait, can you bleach your teeth to death? I wouldn't want to do that.