Read as many reviews about whitening products as you can before buying one. If you take the time to research the products before you spend your money on them, you are sure to find a quality product a lot quicker and without spending as much money.
Drinking through a straw is going to help you keep your teeth looking whiter longer. It will reduce the time that the drink has to settle on your teeth and cause stains. The straw will carry the drink past your teeth and closer to your throat keeping it from getting to your teeth.
When trying to whiten your teeth, use toothpaste specifically made for teeth whitening. These toothpastes use peroxides that act as a bleaching agent for your teeth. Be sure to look at the amount of peroxide in the toothpaste, typically the concentration is between ten and twenty percent. Choose a product in the middle, and if your teeth tolerate the toothpaste (and you want more effective whitening), move up to a toothpaste with 20% peroxide.