Is Listerine good for your teeth?

I bought Listerine Pre Brush Whitening 3 months ago, and there has been little to no difference to my teeth?

• I used it twice a day following the instructions, using it before I brush in the morning and at night. Not only this, but the toothpaste I used was and still using it is Crest 3D white toothpaste. NONE OF THIS STUFF WORKS. You can feel the difference using this toothpaste, but the results show nothing. They say guaranteed whitening in 8 days, and thats total BS. As for the Listerine thats fake, does not work. So I'm deciding on spending $40 for the whitening strips by either Listerine/Crest, the so called "Advance 3D protection whitening" whatever. Should I get it, or will this be a waste? I just want something that can whitened my teeth, is that too much to ask.

• Answer:

  Anything over the counter, be it the white strips, the mouthwash, the trays, etc, have a low concentration (~5%) of bleach/whitening solution. No matter what you use over the counter you may get only 1-2 shades lighter. Most people don't notice much of a difference, but if you want a to lighten up a little it's great. Otherwise, I suggest saving the $40-60 and put it toward professional zoom whitening or custom fit trays with very concentrated bleach (23%) and you'll get 7-9 shades lighter.