Works fast, no side effects
This stuff is great.  My teeth were stained and blotchy from coffee, age, etc.  After even the first application I saw a big difference.  My teeth look much better, without the usual side effects from whiteners, which are gum and tooth pain and enamel damage.  The only down side is the gritty texture, which is yucky, but I can live with that.
Rating: 5 stars