Here we provide links to several scientific studies undertaken at research centers and universities. These studies mostly demonstrate how hydrogen peroxide is much superior to carbamide peroxide, and that light-activated teeth whitening really works.

• Light enhances the tooth-whitening effect of peroxide:
  http://jada.ada.org/cgi/content/abstract/134/2/167   
  
  

• Light enhances the tooth-whitening activity of bleaching kits:
  http://iadr.confex.com/iadr/2006Orld/techprogram/abstract_72887.htm
  
  

• Hydrogen peroxide gives better results than carbamide peroxide:
  http://iadr.confex.com/iadr/2003Goteborg/techprogram/abstract_36990.htm
  
  

• Hydrogen peroxide safe, even when used over a long period of time:
  http://iadr.confex.com/iadr/2006Orld/techprogram/abstract_75233.htm
  
  

• Hydrogen peroxide effective:
  http://iadr.confex.com/iadr/2006Orld/techprogram/abstract_75244.htm
  
  

• Hydrogen peroxide effective, even in low concentrations:
  http://iadr.confex.com/iadr/2006Orld/techprogram/abstract_76356.htm