I have been using this kit from Whitening lightning and I am beyond thrilled about the results! Whitening lightning prides themselves in teeth whitening that is not only safe and effective, but pain and sensitive free. I have to say that I couldn't agree more and it's much cheaper than going to the dentist office....which is always a plus. You can watch this tutorial to see all the details, it's super simple to use! I hope you enjoy and let me know if you try it, I want to hear if you love it as much as I do! ♥