Review (5/5): It works
I have been using this for 4 days and the result is really there. Basically, I applied this composition to the fangs, as they differ in color from all other teeth.
In such a short period of time, I noticed a change of about 2 tones.
Despite the fact that the manufacturer writes that the composition is absolutely safe and natural, I would not use it for more than 7 days in a row. Although the instructions say about 2 weeks of use 2 times a day. So far, I have not risked for such a long period. It's still hydrogen peroxide.
But in general, this whitening pen really works and I cannot but rejoice it.