Step 1: Heat the mouth tray under hot water to warm it up about 10 seconds, then shake excess water off. Attention the mouth trays could not stay in hot water too long, otherwise it may be out of shape.
Step 2: Put the mouth tray over your teeth and use your fingers to gently try to mold it to your teeth.
Step 3: Take the mouth tray out and apply some of the gel evenly into the tray.(0.25 to 0.5ml for each tray, anymore is just wasted).
Step 4: Put the tray back onto your teeth and leave it there for 25 to 30 minutes.