Hello Sweetie! You can try activated charcoal powder, if it is not in this form, take tablets and make them into a powder, it really helps. I know it is blueberry, but it will help you, it does not harm the teeth and enamel. Whitening pastes, I recommend Colgate Max White Expert White - the price is high, but it has an effect of several tones. However, do not expect miracles, LISTERINE mouthwash opens the color of the teeth by at least three tones :)
1 gemibby answered
Try soda, but don't do it often. The other way is a dentist and that's it. But the enamel shrinks and is not good for the teeth at all.