What is the best teeth whitening?

i heard pearl drops were good and blanx...but not sure

anyone tried these/ reccommend these or others?

thank you
Update: i do brush my teeth twice a day but it seems to have no effect and i use collgate total + whitening plus Corsodyl mouthwash and i swear it seems to me like my teeth are yellow...unless im paranoid
Update 2: i already have sensitive teeth.

i dont drink fizzy drinks, coffee, i dont smoke
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