5 simple Steps to Brighter Teeth: Step 1 Brush your teeth and open the foam strip Step 2 Take two foam strips and put them in the mouthpiece using the provided tweezers Step 3 Lock down and put the mouthpiece in your mouth.  Make sure the foam strips press firmly to the front side of your teeth. Step 4 Put your lips over the tray.  Due to the built-in focus inside the tray the light will be spread over your teeth. Step 5 Enjoy your session and let the ADT-1500SP do its work for 15 minutes. Dispose of mouthpiece at the time of treatment completion. Click HERE to find out about your FREE Teeth Whitening treatment