How does bleaching?

When bleaching of teeth will bleach - mostly consisting of hydrogen peroxide H2O2 applied to the teeth. The enamel pigments are thus entering brightened and the teeth appear whiter.
When bleaching is useful / recommended?
Bleaching should only be healthy, intact teeth are applied. Before the tooth whitening bleach should be tried by the discoloration by a professional teeth cleaning, including Airflow to remove. Before the brightening must be noted that any crowns or not with prostheses can be brightened. It may thus come to color.
Methods of bleaching
Home bleaching
is a gentle and painless method of the teeth at home practitioners.
There are imprints of the maxilla and mandible taken in models manufactured and prepared slides, then for about 1-2 weeks at night with bleach worn.