So far so good
This teeth whitening pen is very easy to use, just click the bottom of the pen to dispense the whitening liquid up to the application brush. Unfortunately, I have only been using it for a week and don't see too much improvement yet. However, despite the short period of use I am starting to see my teeth whiten. I am hopeful that this product will continue to produce the results it has advertised.
Rating: 4 stars