Vagus nerve stimulation has been used for the treatment of severe epilepsy for many years and it has been shown to be useful. However this has extended to the treatment of depression not responding to medications.
Lasers are used to speed up in-office teeth whitening procedures. A peroxide bleaching solution, applied to the tooth surface, is ''activated" by laser energy, which speeds up of the whitening process.
This technique has been proposed for many years as the best technique to bleach non-vital teeth (those teeth which do not have a blood supply) because of the strong interaction between hydrogen peroxide and heat.
Home bleaching can be done in the convenience of your own home, and is usually more affordable than other options. Commercial whitening products intended for home use include gels, chewing gums, among others.