The causes of yellowing teeth come from your daily habits, disease history and age, often drinking coffee, smoking, and eating foods that are too dark.
According to the cause of staining, it can be divided into extrinsic staining & intrinsic staining
After applying hydrogen peroxide (H2O2) gel on the teeth, irradiating low temperature cold light to open the dentinal tubule channels under the tooth enamel surface, so that the pigment deposited on the teeth is decomposed, and the teeth have the effect of whitening