Generally, when doing cold light whitening treatment, you need to pay attention to some sensitivity after treatment. It will recover over time. Avoid hot and cold drinks within 24 hours after treatment. In order to prevent the teeth from absorbing more pigment after cold light whitening, it is best not to eat foods that are easy to stain within a week, such as hot pot, coffee, Chinese medicine, and strong tea. etc. After treatment, regular check-ups and teeth cleanings are required to maintain teeth whitening. It is recommended to consume colorless foods such as milk and white porridge.