Hello, cold light whitening teeth has no side effects. It is an advanced and mature tooth whitening technology. No side effects on teeth and body. It is a special whitening agent, which is coated on the teeth with cold light to whiten the yellow teeth. Cold light whitening surgery is simple and does not touch the mouth; In the process of tooth beautification, there is no serious pain, and the side effects of cold light whitening teeth can be said to be basically absent. This technology can not only remove dental calculus in teeth and teeth, but also remove pigment deposits on the surface of teeth. Cold light whitening can also go deep into teeth to achieve the effect of decoloration and whitening.