Gently brush teeth with toothpasteTake both batteries out of the LED Light, remove plastic and reinsert the batteries with the writing side facing upAttach the mouth tray to the led lightTwist top off gel syringe and apply 1/4 of the gel to the top and 1/4 to the bottom of the mouth trayPut it in your mouth and turn the light onWait for light to turn off after 10 minutesRinse mouth out with warm waterSmile!