There are many reasons for tooth blackening, nothing more than the following: tooth decay leads to tooth blackening; Drinking tea, coffee and smoking lead to blackening of teeth; One of the reasons for the blackening of tetracycline teeth and dental fluorosis teeth; After filling the teeth, the teeth turn black; After root canal treatment, the dead pulp teeth will gradually turn black. Laser micro-plastic surgery in Chongqing Wuzhou-Laser whitening teeth can not only remove the pigment deposits on the surface of teeth, but also enter the deep layer of teeth to achieve the effect of decoloration. It only takes two hours to see the excellent whitening effect, and one treatment can improve the tooth surface by three to four whiteness.