Laser teeth whitening - Laser teeth whitening is extremely effective and fast. It will set you back quite a lot of money, however.
Whitening Trays - White trays come in two varieties: over-the-counter and not-over-the-counter. The over-the-counter trays are very effective, and the not-over-the-counter trays are even more effective. A common brand of over-the-counter whitening trays is Aquafresh White Trays.
Whitening Strips - Whitening strips have varying degrees of effectiveness; they come in strengths of anywhere from 6% hydrogen peroxide to 14%. The Common brand is Crest Whitestrips, which comes in many varieties: Renewal, Classic, Premium, Premium Plus, Pro Effects, Advanced Seal, Daily Whitening Multicare, Daily Whitening Multicare with Tartar Control, Professional, and Supreme.
Whitening Toothpastes - Whitening toothpaste is not effective, as it does not contain a bleaching agent. It contains abrasive materials, which are designed to knock off discoloring particles, but it does not bleach the teeth.
Whitening Mouthwashes - These are the most ineffective of all whiteners; they do contain a bleaching agent, however. But, this bleaching agent is virtually useless, since it is only held in the mouth for one minute; bleaching agents need to be on the teeth for at least twenty minutes to take much effect. Listerine makes a popular brand of whitening mouthwash.