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@midlife
There is no such thing as effective whitening toothpaste, just stain removal.
Common whitening is 10% carbamide peroxide in a whitening tray overnight for two weeks. Been using it since the 80's
Good consistent results and the bang per buck bit is that the effect lasts for years. The result of low concentration over a long time is long lasting result. Higher concentration whitens quicker but also more rebound to the original colour.
I use opalescence by optident but other systems are available, some which use hydrogen peroxide which gives similar results and the tray can be worn only 2 hours a day.
There are loads and loads of arguments about the best way to whiten teeth. I wonder if colgate are still making whitening strops, not checked for years. They are not bad at just refreshing the six upper front teeth.