Don't be taken in by the so called celebrities 'california white' teeth, this is not the natural colour for most people, they nearly all have their teeth bleached. Teeth are naturally ivory coloured and like ivory can range from very white to nearly yellow. Bleaching will make your teeth more sensitive. If you insist on having them bleached be sure to go to a reputable dentist and don't try to diy on the cheap.
But, it's a shame if you get sucked into the current trend of looking like a plastic doll instead of a real person.