Well you could always try out some of the new products out there. I came across a teeth-whitening kit free trial just the other day and it worked great, both for causing whiteness and for maintaining it.
Here's the site where I applied, not sure if it's still available, but go give it a try: www.illumi-brite.com/
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Posted to Tips to maintain teeth whitening results? on 21 Oct 2010
Here's the site where I applied, not sure if it's still available, but go give it a try: www.illumi-brite.com/