Jack, not all whitening systems are the same. I do not use Zoom or any other 1 hour whitening system at all. In my hands, I have far, far better results with different systems which so far has been a lot more stable long term. If its purely tobacco and coffee stains I'd suggest starting with Opalescence toothpaste first to remove as much of that superficial staining as possible.
i have different levels of tooth whitening products and they range in price from £250-£850. They are not the same systems or products!
Feel free to contact me if you have any further questions
Hope this helps
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