White Light Smile kit has been confirmed to be entirely harmless as it is an all natural formula without proxides. However, up until recently most teeth brightening was performed utilizing peroxide based formulas.Peroxide is also the main active White Light Smile ingredient used to bleach and dye your hair. Unnecessary to say there were lots of risks with this method, not least the burning of your gums and increased hurt and sensitivity both throughout and after treatment.In 2011 peroxide kits were banned from sale in the USA unless the cure was performed by a competent dentist. Therefore if you see any peroxide based kits for sale please stay clear they are not safe and are actually illegal to buy in USA. http://drozforskolin.org/white-light-smile-reviews/