Omg. I love it. I have insanely sensitive teeth and after the first use I saw a difference. There is absolutely no pain . There are 3 syringes that come with it so you also get multiple uses for your money. I'm very happy . O and also there is no way for you to lose track of time. It automatically shuts off after 10 minuates, so you just press the button again. It's a slice of cake.