I have been using this product for a week and the results are simply amazing. I never would have believed that these strips would whiten my horribly looking yellow teeths so fast. Its a home kit i used for 2 weeks, 30 minutes daily. There were no side effects. With the mouth trays i used before it was painful and not effective. But these strips really works. If you want one, you can call me to place your orders now 08188587526