What is the best way to effectively whiten teeth?

Whitening. The best way to whiten your teeth is to see your dentist to make sure you have no cavities and that you can get a prescriptioned medication that is not harmful or painful. It is worth it.
Several. There are several ways to whiten your teeth, but i would not consider the toothpastes that claim "whitening" or the otc methods. The best way to get a predictable tooth whitening is by a dentist. There are several sophisticated procedures with special lights and special lightening solutions (that are a lot stronger than can be bought otc.) bleaching trays are often made for home bleaching.