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Crest whitening strips tend to come out tops for over-the-counter
whitening products, or else you can have your dentist custom-make a
whitening tray for you. These are more popular these days than
in-office whitening, because a lower concentration of peroxide can be
used, meaning less sensitivity. "Whitening toothpastes" are next to
useless. One thing to be aware of: bonding/white fillings, crowns, etc.
will not bleach, so if you have any visible restorations of this sort,
they may need to be replaced in order to match the whitened teeth.