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You can not achieve a brilliant white unless that's the colour your teeth were originally.
It is simply not possible.
Those overly white teeth are veneers, crowns or similar.
Just to add this ~
While you're bleaching your teeth, they will appear whiter but a week or two after the bleaching is finished, they settle down to their true colour.
In my case this is cream
Have you ever noticed what naturally lovely teeth a lot of black people have though?
YESSSSS .... amazing and very beautiful, strong-looking teeth.
My 'bloke' has been using bicarb of soda to brush his teeth every day for a few months now and they are definitely looking brighter.
He's had a sore gum for a loooong time and that seems to be OK now too !!!