Whitening options for your teeth
 

Tooth whitening can be obtained economically through dentist-supervised
at-home bleaching. Some bleaching systems, which bleach your teeth while you sleep, work in 10 to 14 days (or more accurately nights)! Others bleach your teeth from two to four hours a day requiring three to six weeks to complete.
 

Also it's important to know that certain types of stain respond better to different types of whitening materials. In such cases, your dentist may recommend one method over the other.