Unfortunately, we are not naturally given to have bright white teeth. Even with celebrities — most of them have used an artificial way to white teeth, by means of teeth whitening.
White Teeth Trend

Especially in America thereit has long been a trend for teeth whitening. It is often “just between” done as a lunch treat, like a visit to the manicurist. It is obviously very nice to have beautiful white teeth. This will give you a smile! And who does not like to look there best?
Is teeth whitening harmful?

If done improperly, it could damage the tooth enamel, and lead to very painful and sensitive teeth. Yet, the Consumer Association has therefore conducted research into the effects of teeth whitening. In the article “Tooth whitening can not hurt” in the Consumer Guide of May 2009 discusses the safety and effectiveness of different methods of teeth whitening. The general conclusion is that teeth whitening can indeed do no harm, provided of course that certain conditions are met.

Teeth Whitening Clinics

Thus, the article praised teeth whitening clinics that promise in 1 hour or more teeth 10 shades whiter it. This seems at first to do so, drying the teeth by the (often very expensive) treatment, making them milky white after just one treatment. Once again, however, they absorb moisture, resulting in darker colors. And then there appear many more expensive treatments needed to achieve the desired effect.
Most effective home teeth whitening

At home you can whiten your teeth with a mouth tray with whitening gel every day for 30-60 minutes. This costs more time, but in the long term keeps your teeth whiter. Furthermore, it is painful, you can stop when you feel your teeth ‘white enough’ (not ‘overbleaching’), and also important: it is much cheaper doing the teeth whitening in a clinic. Hence, the Consumers’ Association recommends the home teeth whitening under the supervision of your dentist.