Teeth whitening is a cosmetic procedure that involves the use of teeth bleaching techniques or surface masking techniques to achieve a whiter tooth color. Depending on the shade of the teeth color and the cause of the stains and pigmentation formation, whitening can be done in different ways. Currently common treatment methods include tooth polishing, scaling, sandblasting, cold light whitening, etc. The specific risks that may arise are as follows: 1, tooth sensitivity: some patients may experience tooth sensitivity, alleviating the sensitivity can be a combination of methods, such as changing the treatment time, changing the frequency of treatment, the use of medication, desensitizing toothpaste, etc.; 2, the enamel surface micro-hardness decline: the use of bleaching agents can cause the enamel surface micro-hardness decline, waiting for 1 year after bleaching to reduce the enamel surface. Decrease in hardness, waiting 1-2 weeks after bleaching can make this side effect weakened; 3, soft tissue damage: teeth whitening treatment process, can cause damage to the soft tissues around the teeth, the clinical manifestation of the gums whitish color, the patient has a sense of pain. The way to avoid soft tissue damage is to strengthen the protective measures before the start of treatment, as well as the doctor’s operation process needs to be cautious and careful. In addition, in the teeth whitening surgery also need to take care of, teeth sensitive people can follow the doctor’s instructions to apply desensitizing toothpaste brush, in order to alleviate the symptoms of tooth sensitivity. Insist on brushing before going to bed and after waking up in the morning to keep your mouth clean, and make regular follow-up visits to observe the effect of the treatment.