It also uses a peroxide agent, which is coated on the surface of the teeth, irradiated and deactivated by a plasma machine, and catalyzed the redox reaction of the drug to achieve the effect of teeth whitening. It takes about 1 hour for each course of treatment and must be done in the dental clinic. The whole course of treatment is 3 to 5 times to achieve the whitening results that ordinary patients want. It is usually only done on the front teeth of the upper and lower rows, on the buccal side. Counted from the midline, upper, lower, left and right, 4 on each side, 16 buccal sides of the teeth.
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