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Step 1: Let yourself fill the tray.
Heat the mouthpiece with hot water at 80°C and heat it for about 10 seconds. Place the mouthpiece on the teeth, try gently with your fingers until it makes the teeth moldy, and then fix the mouthpiece tightly on the teeth.

Step 2: Compare the tooth shadow guides of the used teeth.

Step 3: Apply a thin layer of whitening gel on the two mouth pads and apply it evenly (a waste of 0.25 to 0.4 ml for each mouth pad is wasted).

Step 4: Insert the oral tray into the mouth and above the teeth, and then firmly