Teeth born yellow may be tetracycline teeth or genetic factors, can be treated by cold light whitening or veneer restoration, as follows. 1. Cold light whitening: oxidative bleaching, through the cold light irradiation, so that the whitening agent penetrates into the enamel and dentin tubules, and pigment redox reaction, in order to achieve the whitening effect. Cold light instrument irradiation temperature is low, less damage to the dental pulp. 2. Veneer restoration: Use porcelain or resin and other restorative materials made of veneer, in the case of less or no grinding teeth will be directly or indirectly bonded to the tooth surface, cover the original color of the tooth, to achieve the whitening effect. It is recommended to go to regular medical institutions to receive professional treatment.