What are the risks of bleaching?

The risks of a well-executed professional treatment are virtually nil, and the gum irritation, hypersensitivity, potential side effects, cancel out in strict protocols specified, and in any case, should they occur, are usually minimal and transient.
A careful study has detected the safety of whitening treatments performed with a peroxide-based products for the hard tissue of teeth, both in terms of fair use is in cases of overuse.
The measurements before and after bleaching treatment showed no effects on surface hardness of enamel, and even changes in its surface and subsurface prismatic structure. This evidence confirms what is in the consciousness of dentists experts, namely that the whitening treatments are safe, fast and effective, when operated according to their requirements, with their techniques and under their supervision.