Nowadays, dental bleaching can be done in the home and/or in the office. Office bleaching uses special
techniques with gels for approximately 30 minutes per session. Generally, only a few sessions are needed,
depending on patients’ requirements. For home bleaching, patients take a dentist-supplied tray, which has
been individually prepared, puts the whitening gel in it, and then puts the tray over the teeth for a few hours a
day for a week or two. Generally dentists think that the most long lasting results are achieved through a
combination of office and home sessions.