Step 1: Prepare the mouth trays.Heat the mouth tray in 80% hot water and heat it for about 10 seconds. Place the mouth tray over your teeth, use your fingers gently, try to shape your teeth, place the trays firmly against your teeth.Step 2: Compare the teeth used.Step 3: Apply a thin layer of whitening gel to the two mouth trays and spread evenly (0.25 to 0.4 ml for each tray is just wasted).Step 4: Insert the mouth trays into your mouth and over your teeth, place the trays firmly against your teeth. Step 5: Have thecustomer insert the tray for 10 minutes or 7 minutes and then rinse with water.Step 6: After teeth whitening, use mouthspray. This can make you breathe fresh. Repeat this complete treatment 2 times, make sure to rinse and dry the tray between sessions, or once a day, after 3 days, compare before and after with the teeth tint guide, we can improve teeth from 7 to 10 shades. o