I have been using this for over a month now, and to be honest I have not been consistent with the application. Results will vary from person to person, depending on ones’ stains. For me, I do not see a major difference though there is a slight colour change to white after each usage.
What I love about the strips is that it is quite thin, very flexible, so after a few seconds you almost feel nothing is on. Moulding perfectly to the shape of your teeth. It may taste a little funny at the start, because of the tooth whitening gel. It does contain hydrogen peroxide, so be wary if you have very sensitive teeth/gums. I use mine once a day for 30 minutes, but if you want best results, use twice a day and complete 2 packs.