Their product does not work! Not even one tenth of a shade lighter! When I asked for a refund, it was refused, and the owner called Salomon of this teeth whitening scam at Aventura Mall became argumentative and verbally abusive citing that "what do you expect for $100?!?!" "Do you know who I am!?" "I don't five refunds!" "Leave or I will have you banned from this mall!" "Show me written proof that your teeth were not darker before the treatment!" Avoid at all cost! Their so called teeth whitening is not even worth 10 Cents!