The principle of laser tooth whitening is that bleaching agent is coated on the cleaned and pretreated teeth, and then the bleaching agent is decomposed by laser catalysis to produce free oxygen atoms, which have high activity and can go deep into the teeth and be released after being widely combined with pigment molecules.

Because the irradiation of laser whitening teeth can fully open dentinal tubules and enhance the permeability of teeth, the effect of whitening drugs can be improved by 27 times. It is especially suitable for the treatment of exogenous pigment teeth, which can generally improve 2-4 color levels, quickly restore white luster and present natural primary colors of teeth. It also has a good effect on less serious tetracycline teeth and dental fluorosis. Especially compared with other whitening technologies, the duration of laser whitening is longer, which can generally reach 3-5 years.