The third step: smear whitening agent, cold light for 8 minutes.
Step 4: remove the whitening agent, and then coated with a new layer of whitening agent, cold light for 8 minutes.
Step 5: Repeat the fourth step, a total of cold light irradiation 3 times (8 minutes each time).
Step 6: remove the treatment items, warm water mouthwash.
Note: Due to the different monitor and light effects, the actual color of the item might be slightly different from the color showed in the pictures. Thank you! Please allow 1-3cm measuring deviation due to manual measurement.