How to whitten my teeth?

See your dentist: It is unknown whether the color of your teeth is natural or embedded or superficial stains. Before whitening is attempted, superficial stains need to be removed.

Carefully: You can try OTCs such as whiting toothpastes or whitening strips, but these will only produce moderate change. Best to have teeth professionally cleaned, then work with your Dentist to whiten teeth with custom trays/gels.