STEP 1: Open the back of the LED light and remove the batteries and transparent plastic tab that is below the batteries.
STEP 2: Discard tab, re-insert batteries. Close the battery compartment.
STEP 3: Press the top button to turn light on.
STEP 4: Once the gel has been applied to the tray and already in your mouth, place the light in your mouth by putting the light’s clear shield between the trays and the inside of your lips. Keep the light there during the application.